#include "horses.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef pair<ll, ll> pll;
typedef vector<ll> vl;
const ll LLINF = 1e18;
const ll MOD = 1e9+7;
const int MAXN = 5e5+1000;
int n;
vl t(MAXN*2);
void build(vl &a) {
for (int i = 0; i < n; i++) t[i+n] = a[i];
for (int i = n-1; i > 0; i--) t[i] = t[i*2]*t[i*2+1];
}
void modify(ll i, ll v) {
for (t[i += n] = v; i > 1; i /= 2) t[i/2] = t[i]*t[i^1];
}
ll query(int l, int r) { // [l, r)
ll ans = 1;
for (l += n, r += n; l < r; l >>= 1, r >>= 1) {
if (l&1) ans = (ans*t[l++])%MOD;
if (r&1) ans = (ans*t[--r])%MOD;
}
return ans;
}
vl x, y;
ll getBest() {
ll ans = 0;
ll mult = 1;
for (int i = 0; i < n; i++) {
mult = (mult*x[i])%MOD;
ans = max(ans, (mult*y[i])%MOD);
}
//cout << ans << endl;
return ans;
}
int init(int N, int X[], int Y[]) {
n = N;
x = vl(n);
y = vl(n);
for (int i = 0; i < n; i++) x[i] = X[i], y[i] = Y[i];
return getBest();
}
int updateX(int pos, int val) {
x[pos] = val;
return getBest();
}
int updateY(int pos, int val) {
y[pos] = val;
return getBest();
}
