diff --git a/usr/rsc/gmp/6c.c b/usr/rsc/gmp/6c.c
deleted file mode 100644
index 996b1e3d9a6..00000000000
--- a/usr/rsc/gmp/6c.c
+++ /dev/null
@@ -1,117 +0,0 @@
-// Copyright 2009 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-#include "runtime.h"
-#include "cgocall.h"
-
-typedef struct Int Int;
-struct Int
-{
-	void *v;
-};
-
-// turn on ffi
-#pragma dynld initcgo initcgo "libcgo.so"
-#pragma dynld cgo cgo "libcgo.so"
-
-#pragma dynld c_free free "gmp.so"
-void (*c_free)(void*);
-
-// pull in gmp routines, implemented in gcc.c, from gmp.so
-#pragma dynld gmp_addInt gmp_addInt "gmp.so"
-#pragma dynld gmp_stringInt gmp_stringInt "gmp.so"
-#pragma dynld gmp_newInt gmp_newInt "gmp.so"
-#pragma dynld gmp_subInt gmp_subInt "gmp.so"
-#pragma dynld gmp_mulInt gmp_mulInt "gmp.so"
-#pragma dynld gmp_divInt gmp_divInt "gmp.so"
-#pragma dynld gmp_modInt gmp_modInt "gmp.so"
-#pragma dynld gmp_expInt gmp_expInt "gmp.so"
-#pragma dynld gmp_gcdInt gmp_gcdInt "gmp.so"
-#pragma dynld gmp_negInt gmp_negInt "gmp.so"
-#pragma dynld gmp_absInt gmp_absInt "gmp.so"
-#pragma dynld gmp_cmpInt gmp_cmpInt "gmp.so"
-#pragma dynld gmp_stringInt gmp_stringInt "gmp.so"
-#pragma dynld gmp_probablyPrimeInt gmp_probablyPrimeInt "gmp.so"
-#pragma dynld gmp_lshInt gmp_lshInt "gmp.so"
-#pragma dynld gmp_rshInt gmp_rshInt "gmp.so"
-#pragma dynld gmp_lenInt gmp_lenInt "gmp.so"
-#pragma dynld gmp_setInt gmp_setInt "gmp.so"
-#pragma dynld gmp_setBytesInt gmp_setBytesInt "gmp.so"
-#pragma dynld gmp_setStringInt gmp_setStringInt "gmp.so"
-#pragma dynld gmp_bytesInt gmp_bytesInt "gmp.so"
-#pragma dynld gmp_divModInt gmp_divModInt "gmp.so"
-#pragma dynld gmp_setInt64Int gmp_setInt64Int "gmp.so"
-#pragma dynld gmp_int64Int gmp_int64Int "gmp.so"
-
-void (*gmp_addInt)(void*);
-void (*gmp_stringInt)(void*);
-void (*gmp_newInt)(void*);
-void (*gmp_subInt)(void*);
-void (*gmp_mulInt)(void*);
-void (*gmp_divInt)(void*);
-void (*gmp_modInt)(void*);
-void (*gmp_expInt)(void*);
-void (*gmp_gcdInt)(void*);
-void (*gmp_negInt)(void*);
-void (*gmp_absInt)(void*);
-void (*gmp_cmpInt)(void*);
-void (*gmp_stringInt)(void*);
-void (*gmp_probablyPrimeInt)(void*);
-void (*gmp_lshInt)(void*);
-void (*gmp_rshInt)(void*);
-void (*gmp_lenInt)(void*);
-void (*gmp_setInt)(void*);
-void (*gmp_setBytesInt)(void*);
-void (*gmp_setStringInt)(void*);
-void (*gmp_bytesInt)(void*);
-void (*gmp_divModInt)(void*);
-void (*gmp_setInt64Int)(void*);
-void (*gmp_int64Int)(void*);
-
-void gmp·addInt(Int *z, Int *x, Int *y, Int *ret) { cgocall(gmp_addInt, &z); }
-void gmp·subInt(Int *z, Int *x, Int *y, Int *ret) { cgocall(gmp_subInt, &z); }
-void gmp·mulInt(Int *z, Int *x, Int *y, Int *ret) { cgocall(gmp_mulInt, &z); }
-void gmp·divInt(Int *z, Int *x, Int *y, Int *ret) { cgocall(gmp_divInt, &z); }
-void gmp·modInt(Int *z, Int *x, Int *y, Int *ret) { cgocall(gmp_modInt, &z); }
-void gmp·expInt(Int *z, Int *x, Int *y, Int *m, Int *ret) { cgocall(gmp_expInt, &z); }
-void gmp·GcdInt(Int *d, Int *x, Int *y, Int *a, Int *b) { cgocall(gmp_gcdInt, &d); }
-void gmp·negInt(Int *z, Int *x, Int *ret) { cgocall(gmp_negInt, &z); }
-void gmp·absInt(Int *z, Int *x, Int *ret) { cgocall(gmp_absInt, &z); }
-void gmp·CmpInt(Int *x, Int *y, int32 ret) { cgocall(gmp_cmpInt, &x); }
-void gmp·probablyPrimeInt(Int *z, int32 nreps, int32 pad, int32 ret) { cgocall(gmp_probablyPrimeInt, &z); }
-void gmp·lshInt(Int *z, Int *x, uint32 s, Int *ret) { cgocall(gmp_lshInt, &z); }
-void gmp·rshInt(Int *z, Int *x, uint32 s, Int *ret) { cgocall(gmp_rshInt, &z); }
-void gmp·lenInt(Int *z, int32 ret) { cgocall(gmp_lenInt, &z); }
-void gmp·setInt(Int *z, Int *x, Int *ret) { cgocall(gmp_setInt, &z); }
-void gmp·setBytesInt(Int *z, Array b, Int *ret) { cgocall(gmp_setBytesInt, &z); }
-void gmp·setStringInt(Int *z, String s, int32 base, int32 ret) { cgocall(gmp_setStringInt, &z); }
-void gmp·bytesInt(Int *z, Array ret) { cgocall(gmp_bytesInt, &z); }
-void gmp·DivModInt(Int *q, Int *r, Int *x, Int *y) { cgocall(gmp_divModInt, &q); }
-void gmp·setInt64Int(Int *z, int64 x, Int *ret) { cgocall(gmp_setInt64Int, &z); }
-void gmp·int64Int(Int *z, int64 ret) { cgocall(gmp_int64Int, &z); }
-
-void
-gmp·stringInt(Int *z, String ret)
-{
-	struct {
-		Int *z;
-		byte *p;
-	} a;
-	a.z = z;
-	a.p = nil;
-	cgocall(gmp_stringInt, &a);
-	ret = gostring(a.p);
-	cgocall(c_free, a.p);
-	FLUSH(&ret);
-}
-
-void
-gmp·NewInt(uint64 x, Int *z)
-{
-if(sizeof(uintptr) != 8) *(int32*)0 = 0;
-	z = mallocgc(sizeof *z);
-	FLUSH(&z);
-	cgocall(gmp_newInt, &x);
-}
-
diff --git a/usr/rsc/gmp/Makefile b/usr/rsc/gmp/Makefile
deleted file mode 100644
index 93053d0f4b8..00000000000
--- a/usr/rsc/gmp/Makefile
+++ /dev/null
@@ -1,52 +0,0 @@
-# Copyright 2009 The Go Authors.  All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
-
-# FFI demo
-
-include ../../../src/Make.$(GOARCH)
-
-all: gmp.a gmp.so
-
-gcc.o: gcc.c
-	gcc -fPIC -O2 -o gcc.o -c gcc.c
-
-gmp.so: gcc.o
-	gcc -shared -o gmp.so gcc.o -L$(GOROOT)/pkg/$(GOOS)_$(GOARCH) -lcgo -lgmp
-
-gmp.a: 6c.6 go.6
-	gopack grc gmp.a 6c.6 go.6
-
-# from pkg/runtime/Makefile: TODO(rsc): how to deal with this?
-# Set SIZE to 32 or 64.
-SIZE_386=32
-SIZE_amd64=64
-SIZE_arm=32
-SIZE=$(SIZE_$(GOARCH))
-
-# Setup CFLAGS.  Add -D_64BIT on 64-bit platforms (sorry).
-CFLAGS_64=-D_64BIT
-# TODO(kaib): fix register allocation to honor extern register so we
-# can enable optimizations again.
-CFLAGS_arm=-N
-CFLAGS=-I$(GOOS) -I$(GOOS)/$(GOARCH) -wF $(CFLAGS_$(SIZE)) $(CFLAGS_$(GOARCH))
-
-6c.6: 6c.c
-	6c -FVw $(CFLAGS) -I$(GOROOT)/src/pkg/runtime 6c.c
-
-go.6: go.go
-	6g go.go
-
-PKG=$(GOROOT)/pkg/$(GOOS)_$(GOARCH)
-
-install: $(PKG)/gmp.so $(PKG)/gmp.a
-
-$(PKG)/gmp.so: gmp.so
-	cp gmp.so $@
-
-$(PKG)/gmp.a: gmp.a
-	cp gmp.a $@
-
-clean:
-	rm -f *.6 *.o *.so *.a
-
diff --git a/usr/rsc/gmp/gcc.c b/usr/rsc/gmp/gcc.c
deleted file mode 100644
index a28266df649..00000000000
--- a/usr/rsc/gmp/gcc.c
+++ /dev/null
@@ -1,349 +0,0 @@
-// Copyright 2009 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-#include <stdint.h>
-#include <gmp.h>
-#include <string.h>
-
-typedef int32_t int32;
-typedef uint32_t uint32;
-typedef int64_t int64;
-typedef uint64_t uint64;
-
-typedef struct Slice Slice;
-struct Slice
-{
-	void *data;
-	uint32 len;
-	uint32 cap;
-};
-
-typedef struct String String;
-struct String
-{
-	void *data;
-	uint32 len;
-};
-
-typedef struct Int Int;
-struct Int
-{
-	mpz_t *mp;
-};
-
-void
-gmp_newInt(void *v)
-{
-	struct {
-		uint64 x;
-		Int *z;
-	} *a = v;
-
-	a->z->mp = malloc(sizeof *a->z->mp);
-	mpz_init_set_ui(*a->z->mp, a->x);
-}
-
-void
-gmp_addInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		Int *y;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_add(*a->z->mp, *a->x->mp, *a->y->mp);
-}
-
-void
-gmp_subInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		Int *y;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_sub(*a->z->mp, *a->x->mp, *a->y->mp);
-}
-
-void
-gmp_mulInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		Int *y;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_mul(*a->z->mp, *a->x->mp, *a->y->mp);
-}
-
-void
-gmp_setInt64Int(void *v)
-{
-	struct {
-		Int *z;
-		int64 x;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_set_si(*a->z->mp, a->x);
-}
-
-void
-gmp_int64Int(void *v)
-{
-	struct {
-		Int *z;
-		int64 ret;
-	} *a = v;
-
-	a->ret = mpz_get_si(*a->z->mp);
-}
-
-void
-gmp_divInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		Int *y;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_div(*a->z->mp, *a->x->mp, *a->y->mp);
-}
-
-void
-gmp_modInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		Int *y;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_mod(*a->z->mp, *a->x->mp, *a->y->mp);
-}
-
-void
-gmp_divModInt(void *v)
-{
-	struct {
-		Int *d;
-		Int *m;
-		Int *x;
-		Int *y;
-	} *a = v;
-
-	mpz_tdiv_qr(*a->d->mp, *a->m->mp, *a->x->mp, *a->y->mp);
-}
-
-void
-gmp_lshInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		uint32 s;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_mul_2exp(*a->z->mp, *a->x->mp, a->s);
-}
-
-void
-gmp_rshInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		int32 s;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_div_2exp(*a->z->mp, *a->x->mp, a->s);
-}
-
-
-void
-gmp_expInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		Int *y;
-		Int *w;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_powm(*a->z->mp, *a->x->mp, *a->y->mp, *a->w->mp);
-}
-
-void
-gmp_gcdInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		Int *y;
-		Int *a;
-		Int *b;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_gcdext(*a->z->mp, *a->x->mp, *a->y->mp, *a->a->mp, *a->b->mp);
-}
-
-void
-gmp_negInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_neg(*a->z->mp, *a->x->mp);
-}
-
-void
-gmp_absInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_abs(*a->z->mp, *a->x->mp);
-}
-
-void
-gmp_cmpInt(void *v)
-{
-	struct {
-		Int *x;
-		Int *y;
-		int32 ret;
-	} *a = v;
-
-	a->ret = mpz_cmp(*a->x->mp, *a->y->mp);
-}
-
-void
-gmp_stringInt(void *v)
-{
-	struct {
-		Int *z;
-		char *p;
-	} *a = v;
-
-	a->p = mpz_get_str(NULL, 10, *a->z->mp);
-}
-
-void
-gmp_setInt(void *v)
-{
-	struct {
-		Int *z;
-		Int *x;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_set(*a->z->mp, *a->x->mp);
-}
-
-void
-gmp_setBytesInt(void *v)
-{
-	struct {
-		Int *z;
-		Slice b;
-		Int *ret;
-	} *a = v;
-
-	a->ret = a->z;
-	mpz_import(*a->z->mp, a->b.len, 1, 1, 1, 0, a->b.data);
-}
-
-void
-gmp_lenInt(void *v)
-{
-	struct {
-		Int *z;
-		int32 ret;
-	} *a = v;
-
-	a->ret = mpz_sizeinbase(*a->z->mp, 2);
-}
-
-void
-gmp_bytesInt(void *v)
-{
-	struct {
-		Int *z;
-		Slice b;
-	} *a = v;
-	size_t n;
-	char *p;
-
-	n = (mpz_sizeinbase(*a->z->mp, 2) + 7) >> 3;
-	p = malloc(n);	// TODO: mallocgc
-	mpz_export(p, &n, 1, 1, 1, 0, *a->z->mp);
-	a->b.data = p;
-	a->b.len = n;
-	a->b.cap = n;
-}
-
-void
-gmp_setStringInt(void *v)
-{
-	struct {
-		Int *z;
-		String s;
-		int32 base;
-		int32 pad;
-		int32 ret;
-	} *a = v;
-	char *p;
-
-	p = malloc(a->s.len+1);
-	memmove(p, a->s.data, a->s.len);
-	p[a->s.len] = 0;
-	a->ret = mpz_set_str(*a->z->mp, p, a->base);
-	free(p);
-}
-
-void
-gmp_probablyPrimeInt(void *v)
-{
-	struct {
-		Int *z;
-		int32 nreps;
-		int32 pad;
-		int32 ret;
-	} *a = v;
-
-	a->ret = mpz_probab_prime_p(*a->z->mp, a->nreps);
-}
-
diff --git a/usr/rsc/gmp/go.go b/usr/rsc/gmp/go.go
deleted file mode 100644
index 104070a9d58..00000000000
--- a/usr/rsc/gmp/go.go
+++ /dev/null
@@ -1,130 +0,0 @@
-// Copyright 2009 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-package gmp
-
-import "os"
-
-type Int struct {
-	hidden *byte
-}
-
-func addInt(z, x, y *Int) *Int
-func stringInt(z *Int) string
-func divInt(z, x, y *Int) *Int
-func mulInt(z, x, y *Int) *Int
-func subInt(z, x, y *Int) *Int
-func modInt(z, x, y *Int) *Int
-func rshInt(z, x *Int, s uint) *Int
-func lshInt(z, x *Int, s uint) *Int
-func expInt(z, x, y, m *Int) *Int
-func lenInt(z *Int) int
-func bytesInt(z *Int) []byte
-func setInt(z *Int, x *Int) *Int
-func setBytesInt(z *Int, b []byte) *Int
-func setStringInt(z *Int, s string, b int) int
-func setInt64Int(z *Int, x int64) *Int
-func int64Int(z *Int) int64
-
-// NewInt returns a new Int initialized to x.
-func NewInt(x int64) *Int
-
-// z = x + y
-func (z *Int) Add(x, y *Int) *Int {
-	return addInt(z, x, y)
-}
-
-// z = x - y
-func (z *Int) Sub(x, y *Int) *Int {
-	return subInt(z, x, y)
-}
-
-// z = x * y
-func (z *Int) Mul(x, y *Int) *Int {
-	return mulInt(z, x, y)
-}
-
-// z = x
-func (z *Int) SetInt64(x int64) *Int {
-	return setInt64Int(z, x);
-}
-
-// z = x / y
-func (z *Int) Div(x, y *Int) *Int {
-	return divInt(z, x, y)
-}
-
-// z = x % y
-func (z *Int) Mod(x, y *Int) *Int {
-	return modInt(z, x, y)
-}
-
-// z = x^y if m == nil, x^y % m otherwise
-func (z *Int) Exp(x, y, m *Int) *Int {
-	return expInt(z, x, y, m);
-}
-
-// z = x << s
-func (z *Int) Lsh(x *Int, s uint) *Int {
-	return lshInt(z, x, s);
-}
-
-// z = x >> s
-func (z *Int) Rsh(x *Int, s uint) *Int {
-	return rshInt(z, x, s);
-}
-
-// z = x
-func (z *Int) Set(x *Int) *Int {
-	return setInt(z, x);
-}
-
-// Len returns length of z in bits.
-func (z *Int) Len() int {
-	return lenInt(z);
-}
-
-func (z *Int) String() string {
-	return stringInt(z)
-}
-
-func (z *Int) Int64() int64 {
-	return int64Int(z)
-}
-
-// TODO: better name?  Maybe return []byte instead?
-// Bytes writes a big-endian representation of z into b.
-// If b is not large enough to contain all of z, the lowest
-// bits are stored.
-func (z *Int) Bytes() []byte {
-	return bytesInt(z);
-}
-
-// SetBytes sets z to the integer represented by the bytes of b
-// interpreted as a big-endian integer.
-func (z *Int) SetBytes(b []byte) *Int {
-	return setBytesInt(z, b);
-}
-
-// SetString parses the string s in base b (8, 10, 16) and sets z to the result.
-// It returns an error if the string cannot be parsed or the base is invalid.
-func (z *Int) SetString(s string, b int) os.Error {
-	if b <= 0 || b > 36 || setStringInt(z, s, b) < 0 {
-		return os.EINVAL;
-	}
-	return nil;
-}
-
-// GcdInt sets d to the greatest common divisor of a and b
-// and sets x and y such that d = a*x + b*y.
-// The inputs a and b must be positive.
-// Pass x == nil and y == nil if only d is needed.
-// If a <= 0 or b <= 0, GcdInt sets d, x, and y to zero.
-func GcdInt(d, x, y, a, b *Int)
-
-// CmpInt compares x and y.  The result is -1, 0, +1.
-func CmpInt(x, y *Int) int
-
-// DivModInt sets q = x/y, r = x%y.
-func DivModInt(q, r, x, y *Int)
diff --git a/usr/rsc/gmp/main.go b/usr/rsc/gmp/main.go
deleted file mode 100644
index 0b25d254478..00000000000
--- a/usr/rsc/gmp/main.go
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright 2009 The Go Authors.  All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-
-package main
-
-import big "gmp"
-//import "big"
-import "fmt"
-
-func Fib(n int) *big.Int {
-	a := big.NewInt(0);
-	b := big.NewInt(1);
-
-	for i := 0; i < n; i++ {
-		a, b = b, a;
-		b.Add(a, b);
-	}
-
-	return b;
-}
-
-func main() {
-	for i := 0; i <= 100; i++ {
-		fmt.Println(5*i, Fib(5*i));
-	}
-}
diff --git a/usr/rsc/gmp/pidigits.go b/usr/rsc/gmp/pidigits.go
deleted file mode 100644
index 5a7eeae49c3..00000000000
--- a/usr/rsc/gmp/pidigits.go
+++ /dev/null
@@ -1,144 +0,0 @@
-/*
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-    * Redistributions of source code must retain the above copyright
-    notice, this list of conditions and the following disclaimer.
-
-    * Redistributions in binary form must reproduce the above copyright
-    notice, this list of conditions and the following disclaimer in the
-    documentation and/or other materials provided with the distribution.
-
-    * Neither the name of "The Computer Language Benchmarks Game" nor the
-    name of "The Computer Language Shootout Benchmarks" nor the names of
-    its contributors may be used to endorse or promote products derived
-    from this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
-LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-POSSIBILITY OF SUCH DAMAGE.
-*/
-
-/*
-TODO(rsc): delete this comment
-TODO(rsc): move to test/bench once package "big" is ready
-on r45:
-
-make clean
-make install
-goc pidigits.go
-ulimit -v 1000000	# 1GB
-LD_LIBRARY_PATH=$GOROOT/pkg/linux_amd64 6.out
-*/
-
-
-/* The Computer Language Benchmarks Game
- * http://shootout.alioth.debian.org/
- *
- * contributed by The Go Authors.
- * based on pidigits.c (by Paolo Bonzini & Sean Bartlett,
- *                      modified by Michael Mellor)
- */
-
-package main
-
-import (
-	//"big";
-	big "gmp";
-	"flag";
-	"fmt";
-	"runtime";
-)
-
-var n = flag.Int("n", 27, "number of digits");
-var silent = flag.Bool("s", false, "don't print result");
-
-var (
-	tmp1 = big.NewInt(0);
-	tmp2 = big.NewInt(0);
-	numer = big.NewInt(1);
-	accum = big.NewInt(0);
-	denom = big.NewInt(1);
-	ten = big.NewInt(10);
-)
-
-func extract_digit() int64 {
-	if big.CmpInt(numer, accum) > 0 {
-		return -1;
-	}
-
-	// Compute (numer * 3 + accum) / denom
-	tmp1.Lsh(numer, 1).Add(tmp1, numer).Add(tmp1, accum);
-	big.DivModInt(tmp1, tmp2, tmp1, denom);
-
-	// Now, if (numer * 4 + accum) % denom...
-	tmp2.Add(tmp2, numer);
-
-	// ... is normalized, then the two divisions have the same result.
-	if big.CmpInt(tmp2, denom) >= 0 {
-		return -1;
-	}
-
-	return tmp1.Int64();
-}
-
-func next_term(k int64) {
-	y2 := k*2 + 1;
-
-	accum.Add(accum, tmp1.Lsh(numer, 1));
-	accum.Mul(accum, tmp1.SetInt64(y2));
-	numer.Mul(numer, tmp1.SetInt64(k));
-	denom.Mul(denom, tmp1.SetInt64(y2));
-}
-
-func eliminate_digit(d int64) {
-	accum.Sub(accum, tmp1.Mul(denom, tmp1.SetInt64(d)));
-	accum.Mul(accum, ten);
-	numer.Mul(numer, ten);
-}
-
-func printf(s string, arg ...) {
-	if !*silent {
-		fmt.Printf(s, arg);
-	}
-}
-
-func main() {
-	flag.Parse();
-
-	var m int;	// 0 <= m < 10
-	for i, k := 0, int64(0); ; {
-		d := int64(-1);
-		for d < 0 {
-			k++;
-			next_term(k);
-			d = extract_digit();
-		}
-
-		printf("%c", d + '0');
-
-		i++;
-		m = i%10;
-		if m == 0 {
-			printf("\t:%d\n", i);
-		}
-		if i >= *n {
-			break;
-		}
-		eliminate_digit(d);
-	}
-
-	if m > 0 {
-		printf("%s\t:%d\n", "          "[m : 10], *n);
-	}
-
-	fmt.Printf("%d calls; %d %d %d\n", runtime.Cgocalls(), numer.Len(), accum.Len(), denom.Len());
-}