#include "horses.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef double ld;
typedef pair<ll, ll> pll;
const ll LOG2 = 31;
const ll MOD = 1000000007;
const ll inf = 1e17;
#define db(x) cerr << #x << " = " << x << " | "
#define dbg(x) cerr << #x << " = " << x << "\n"
ll n;
vector<ll> x, y;
ll binexp(ll b, ll e) {
ll r = 1;
while (e) {
if (e & 1) r = (r * b) % MOD;
e >>= 1;
b = (b * b) % MOD;
}
return r;
}
int init(int N, int X[], int Y[]) {
n = N;
x.resize(n);
y.resize(n);
for (ll i = 0; i < n; i++) x[i] = X[i], y[i] = Y[i];
return updateX(0, x[0]);
}
int updateX(int pos, int val) {
ld res = log2(y[n - 1] * x[n - 1]);
x[pos] = val;
for (ll i = n - 2; i >= 0; i--) {
res = max(res + log2(x[i]), log2(x[i] * y[i]));
}
return binexp(2, (ll)res);
}
int updateY(int pos, int val) {
y[pos] = val;
return updateX(0, x[0]);
}
