#include "horses.h"
#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int MOD=1e9+7, N=5e5+5;
int x[N], y[N],gn;
int calculate(){
ll m=0,modsk=0;
for(int i=gn-1; i>=0; i--){
m*=x[i];
modsk+=m/MOD;
m%=MOD;
ll r1=1LL*x[i]*y[i];
if(r1/MOD>modsk || (r1/MOD==modsk && r1%MOD>m)){
modsk=r1/MOD;
m=r1%MOD;
}
}
return m;
}
int init(int n, int X[], int Y[]){
gn=n;
for(int i=0; i<n; i++){
x[i]=X[i];
y[i]=Y[i];
}
return calculate();
}
int updateX(int pos, int val) {
x[pos]=val;
return calculate();
}
int updateY(int pos, int val) {
y[pos]=val;
return calculate();
}
