#include <bits/stdc++.h>
#include "horses.h"
#define lson (p<<1)
#define rson (p<<1|1)
#define inf 1000000007
#define mod 1000000007
#define rnd() rand_num()
#define bigrnd() dis(rand_num)
//#pragma GCC optimize("Ofast","inline","-ffast-math")
//#pragma GCC target("avx,sse2,sse3,sse4,mmx")
//#define int long long
using namespace std;
unsigned sed=std::chrono::system_clock::now().time_since_epoch().count();
mt19937 rand_num(sed);
uniform_int_distribution<long long> dis(0,inf);
template <typename T> void read(T &x){
x=0;char ch=getchar();int fh=1;
while (ch<'0'||ch>'9'){if (ch=='-')fh=-1;ch=getchar();}
while (ch>='0'&&ch<='9')x=x*10+ch-'0',ch=getchar();
x*=fh;
}
template <typename T> void write(T x) {
if (x<0) x=-x,putchar('-');
if (x>9) write(x/10);
putchar(x%10+'0');
}
template <typename T> void writeln(T x) {
write(x);
puts("");
}
int n;
long long x[500005],y[500005];
long long mx[2000005],tag[2000005];
long long qpow(long long a,long long b)
{
long long res=1;
while(b)
{
if(b&1) res=res*a%mod;
a=a*a%mod;
b>>=1;
}
return res;
}
void pushup(int p)
{
mx[p]=max(mx[lson],mx[rson]);
}
void build(int p,int l,int r)
{
if(l==r)
{
mx[p]=1;
tag[p]=1;
return;
}
tag[p]=1;
int mid=l+r>>1;
build(lson,l,mid);
build(rson,mid+1,r);
pushup(p);
}
void pushdown(int p)
{
mx[lson]*=tag[p];
mx[lson]%=mod;
tag[lson]*=tag[p];
tag[lson]%=mod;
mx[rson]*=tag[p];
mx[rson]%=mod;
tag[rson]*=tag[p];
tag[rson]%=mod;
tag[p]=1;
}
void modify(int p,int l,int r,int x,int y,long long k)
{
if(x<=l&&r<=y)
{
mx[p]*=k;
mx[p]%=mod;
tag[p]*=k;
tag[p]%=mod;
return;
}
int mid=l+r>>1;
pushdown(p);
if(x<=mid) modify(lson,l,mid,x,y,k);
if(mid+1<=y) modify(rson,mid+1,r,x,y,k);
pushup(p);
}
int init(int N,int X[],int Y[])
{
n=N;
for(int i=1;i<=n;++i)
{
x[i]=X[i-1];
y[i]=Y[i-1];
}
build(1,1,n);
for(int i=1;i<=n;++i)
{
modify(1,1,n,i,n,x[i]);
modify(1,1,n,i,i,y[i]);
}
return mx[1]%mod;
}
int updateX(int pos,int val)
{
pos++;
modify(1,1,n,pos,n,qpow(x[pos],mod-2));
modify(1,1,n,pos,n,val);
x[pos]=val;
return mx[1]%mod;
}
int updateY(int pos,int val)
{
pos++;
modify(1,1,n,pos,pos,qpow(y[pos],mod-2));
modify(1,1,n,pos,pos,val);
y[pos]=val;
return mx[1]%mod;
}
