/*
 * *****************************************************************************
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2018-2021 Gavin D. Howard and contributors.
 *
 * 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.
 *
 * 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 HOLDER 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.
 *
 * *****************************************************************************
 *
 * The second bc math library.
 *
 */

define p(x,y){
	auto a
	a=y$
	if(y==a)return (x^a)@scale
	return e(y*l(x))
}
define r(x,p){
	auto t,n
	if(x==0)return x
	p=abs(p)$
	n=(x<0)
	x=abs(x)
	t=x@p
	if(p<scale(x)&&x-t>=5>>p+1)t+=1>>p
	if(n)t=-t
	return t
}
define ceil(x,p){
	auto t,n
	if(x==0)return x
	p=abs(p)$
	n=(x<0)
	x=abs(x)
	t=(x+((x@p<x)>>p))@p
	if(n)t=-t
	return t
}
define f(n){
	auto r
	n=abs(n)$
	for(r=1;n>1;--n)r*=n
	return r
}
define perm(n,k){
	auto f,g,s
	if(k>n)return 0
	n=abs(n)$
	k=abs(k)$
	f=f(n)
	g=f(n-k)
	s=scale
	scale=0
	f/=g
	scale=s
	return f
}
define comb(n,r){
	auto s,f,g,h
	if(r>n)return 0
	n=abs(n)$
	r=abs(r)$
	s=scale
	scale=0
	f=f(n)
	h=f(r)
	g=f(n-r)
	f/=h*g
	scale=s
	return f
}
define log(x,b){
	auto p,s
	s=scale
	if(scale<K)scale=K
	if(scale(x)>scale)scale=scale(x)
	scale*=2
	p=l(x)/l(b)
	scale=s
	return p@s
}
define l2(x){return log(x,2)}
define l10(x){return log(x,A)}
define root(x,n){
	auto s,m,r,q,p
	if(n<0)sqrt(n)
	n=n$
	if(n==0)x/n
	if(x==0||n==1)return x
	if(n==2)return sqrt(x)
	s=scale
	scale=0
	if(x<0&&n%2==0)sqrt(x)
	scale=s+2
	m=(x<0)
	x=abs(x)
	p=n-1
	q=A^ceil((length(x$)/n)$,0)
	while(r!=q){
		r=q
		q=(p*r+x/r^p)/n
	}
	if(m)r=-r
	scale=s
	return r@s
}
define cbrt(x){return root(x,3)}
define gcd(a,b){
	auto g,s
	if(!b)return a
	s=scale
	scale=0
	a=abs(a)$
	b=abs(b)$
	if(a<b){
		g=a
		a=b
		b=g
	}
	while(b){
		g=a%b
		a=b
		b=g
	}
	scale=s
	return a
}
define lcm(a,b){
	auto r,s
	if(!a&&!b)return 0
	s=scale
	scale=0
	a=abs(a)$
	b=abs(b)$
	r=a*b/gcd(a,b)
	scale=s
	return r
}
define pi(s){
	auto t,v
	if(s==0)return 3
	s=abs(s)$
	t=scale
	scale=s+1
	v=4*a(1)
	scale=t
	return v@s
}
define t(x){
	auto s,c
	l=scale
	scale+=2
	s=s(x)
	c=c(x)
	scale-=2
	return s/c
}
define a2(y,x){
	auto a,p
	if(!x&&!y)y/x
	if(x<=0){
		p=pi(scale+2)
		if(y<0)p=-p
	}
	if(x==0)a=p/2
	else{
		scale+=2
		a=a(y/x)+p
		scale-=2
	}
	return a@scale
}
define sin(x){return s(x)}
define cos(x){return c(x)}
define atan(x){return a(x)}
define tan(x){return t(x)}
define atan2(y,x){return a2(y,x)}
define r2d(x){
	auto r,i,s
	s=scale
	scale+=5
	i=ibase
	ibase=A
	r=x*180/pi(scale)
	ibase=i
	scale=s
	return r@s
}
define d2r(x){
	auto r,i,s
	s=scale
	scale+=5
	i=ibase
	ibase=A
	r=x*pi(scale)/180
	ibase=i
	scale=s
	return r@s
}
define frand(p){
	p=abs(p)$
	return irand(A^p)>>p
}
define ifrand(i,p){return irand(abs(i)$)+frand(p)}
define srand(x){
	if(irand(2))return -x
	return x
}
define brand(){return irand(2)}
define void output(x,b){
	auto c
	c=obase
	obase=b
	x
	obase=c
}
define void hex(x){output(x,G)}
define void binary(x){output(x,2)}
define ubytes(x){
	auto p,i
	x=abs(x)$
	i=2^8
	for(p=1;i-1<x;p*=2){i*=i}
	return p
}
define sbytes(x){
	auto p,n,z
	z=(x<0)
	x=abs(x)
	x=x$
	n=ubytes(x)
	p=2^(n*8-1)
	if(x>p||(!z&&x==p))n*=2
	return n
}
define s2un(x,n){
	auto t,u,s
	x=x$
	if(x<0){
		x=abs(x)
		s=scale
		scale=0
		t=n*8
		u=2^(t-1)
		if(x==u)return x
		else if(x>u)x%=u
		scale=s
		return 2^(t)-x
	}
	return x
}
define s2u(x){return s2un(x,sbytes(x))}
define void plz(x){
	if(leading_zero())print x
	else{
		if(x>-1&&x<1&&x!=0){
			if(x<0)print"-"
			print 0,abs(x)
		}
		else print x
	}
}
define void plznl(x){
	plz(x)
	print"\n"
}
define void pnlz(x){
	auto s,i
	if(leading_zero()){
		if(x>-1&&x<1&&x!=0){
			s=scale(x)
			if(x<0)print"-"
			print"."
			x=abs(x)
			for(i=0;i<s;++i){
				x<<=1
				print x$
				x-=x$
			}
			return
		}
	}
	print x
}
define void pnlznl(x){
	pnlz(x)
	print"\n"
}
define void output_byte(x,i){
	auto j,p,y,b
	j=ibase
	ibase=A
	s=scale
	scale=0
	x=abs(x)$
	b=x/(2^(i*8))
	b%=256
	y=log(256,obase)
	if(b>1)p=log(b,obase)+1
	else p=b
	for(i=y-p;i>0;--i)print 0
	if(b)print b
	scale=s
	ibase=j
}
define void output_uint(x,n){
	auto i
	for(i=n-1;i>=0;--i){
		output_byte(x,i)
		if(i)print" "
		else print"\n"
	}
}
define void hex_uint(x,n){
	auto o
	o=obase
	obase=G
	output_uint(x,n)
	obase=o
}
define void binary_uint(x,n){
	auto o
	o=obase
	obase=2
	output_uint(x,n)
	obase=o
}
define void uintn(x,n){
	if(scale(x)){
		print"Error: ",x," is not an integer.\n"
		return
	}
	if(x<0){
		print"Error: ",x," is negative.\n"
		return
	}
	if(x>=2^(n*8)){
		print"Error: ",x," cannot fit into ",n," unsigned byte(s).\n"
		return
	}
	binary_uint(x,n)
	hex_uint(x,n)
}
define void intn(x,n){
	auto t
	if(scale(x)){
		print"Error: ",x," is not an integer.\n"
		return
	}
	t=2^(n*8-1)
	if(abs(x)>=t&&(x>0||x!=-t)){
		print "Error: ",x," cannot fit into ",n," signed byte(s).\n"
		return
	}
	x=s2un(x,n)
	binary_uint(x,n)
	hex_uint(x,n)
}
define void uint8(x){uintn(x,1)}
define void int8(x){intn(x,1)}
define void uint16(x){uintn(x,2)}
define void int16(x){intn(x,2)}
define void uint32(x){uintn(x,4)}
define void int32(x){intn(x,4)}
define void uint64(x){uintn(x,8)}
define void int64(x){intn(x,8)}
define void uint(x){uintn(x,ubytes(x))}
define void int(x){intn(x,sbytes(x))}
define bunrev(t){
	auto a,s,m[]
	s=scale
	scale=0
	t=abs(t)$
	while(t!=1){
		t=divmod(t,2,m[])
		a*=2
		a+=m[0]
	}
	scale=s
	return a
}
define band(a,b){
	auto s,t,m[],n[]
	a=abs(a)$
	b=abs(b)$
	if(b>a){
		t=b
		b=a
		a=t
	}
	s=scale
	scale=0
	t=1
	while(b){
		a=divmod(a,2,m[])
		b=divmod(b,2,n[])
		t*=2
		t+=(m[0]&&n[0])
	}
	scale=s
	return bunrev(t)
}
define bor(a,b){
	auto s,t,m[],n[]
	a=abs(a)$
	b=abs(b)$
	if(b>a){
		t=b
		b=a
		a=t
	}
	s=scale
	scale=0
	t=1
	while(b){
		a=divmod(a,2,m[])
		b=divmod(b,2,n[])
		t*=2
		t+=(m[0]||n[0])
	}
	while(a){
		a=divmod(a,2,m[])
		t*=2
		t+=m[0]
	}
	scale=s
	return bunrev(t)
}
define bxor(a,b){
	auto s,t,m[],n[]
	a=abs(a)$
	b=abs(b)$
	if(b>a){
		t=b
		b=a
		a=t
	}
	s=scale
	scale=0
	t=1
	while(b){
		a=divmod(a,2,m[])
		b=divmod(b,2,n[])
		t*=2
		t+=(m[0]+n[0]==1)
	}
	while(a){
		a=divmod(a,2,m[])
		t*=2
		t+=m[0]
	}
	scale=s
	return bunrev(t)
}
define bshl(a,b){return abs(a)$*2^abs(b)$}
define bshr(a,b){return (abs(a)$/2^abs(b)$)$}
define bnotn(x,n){
	auto s,t,m[]
	s=scale
	scale=0
	t=2^(abs(n)$*8)
	x=abs(x)$%t+t
	t=1
	while(x!=1){
		x=divmod(x,2,m[])
		t*=2
		t+=!m[0]
	}
	scale=s
	return bunrev(t)
}
define bnot8(x){return bnotn(x,1)}
define bnot16(x){return bnotn(x,2)}
define bnot32(x){return bnotn(x,4)}
define bnot64(x){return bnotn(x,8)}
define bnot(x){return bnotn(x,ubytes(x))}
define brevn(x,n){
	auto s,t,m[]
	s=scale
	scale=0
	t=2^(abs(n)$*8)
	x=abs(x)$%t+t
	scale=s
	return bunrev(x)
}
define brev8(x){return brevn(x,1)}
define brev16(x){return brevn(x,2)}
define brev32(x){return brevn(x,4)}
define brev64(x){return brevn(x,8)}
define brev(x){return brevn(x,ubytes(x))}
define broln(x,p,n){
	auto s,t,m[]
	s=scale
	scale=0
	n=abs(n)$*8
	p=abs(p)$%n
	t=2^n
	x=abs(x)$%t
	if(!p)return x
	x=divmod(x,2^(n-p),m[])
	x+=m[0]*2^p%t
	scale=s
	return x
}
define brol8(x,p){return broln(x,p,1)}
define brol16(x,p){return broln(x,p,2)}
define brol32(x,p){return broln(x,p,4)}
define brol64(x,p){return broln(x,p,8)}
define brol(x,p){return broln(x,p,ubytes(x))}
define brorn(x,p,n){
	auto s,t,m[]
	s=scale
	scale=0
	n=abs(n)$*8
	p=abs(p)$%n
	t=2^n
	x=abs(x)$%t
	if(!p)return x
	x=divmod(x,2^p,m[])
	x+=m[0]*2^(n-p)%t
	scale=s
	return x
}
define bror8(x,p){return brorn(x,p,1)}
define bror16(x,p){return brorn(x,p,2)}
define bror32(x,p){return brorn(x,p,4)}
define bror64(x,p){return brorn(x,p,8)}
define brol(x,p){return brorn(x,p,ubytes(x))}
define bmodn(x,n){
	auto s
	s=scale
	scale=0
	x=abs(x)$%2^(abs(n)$*8)
	scale=s
	return x
}
define bmod8(x){return bmodn(x,1)}
define bmod16(x){return bmodn(x,2)}
define bmod32(x){return bmodn(x,4)}
define bmod64(x){return bmodn(x,8)}