#include "horses.h"
#include "bits/stdc++.h"

using ll = long long;
using namespace std;

struct mint {
	static constexpr int mod = 1'000'000'007;

	int data = 0;

	mint() = default;
	mint(int data) : data(data) {}

	mint operator+(const mint &other) const {
		int res = data + other.data;
		if (res >= mod) {
			res -= mod;
		}
		return res;
	}

	mint operator-(const mint &other) const {
		int res = data + mod - other.data;
		if (res >= mod) {
			res -= mod;
		}
		return res;
	}

	mint operator*(const mint &other) const {
		return mint(1ll * data * other.data % mod);
	}
};

int n;
vector<mint> x;
vector<mint> y;

int calc() {
	vector<mint> dp(n);
	dp[n - 1] = x[n - 1] * y[n - 1];
	for (int i = n - 2; i >= 0; i--) {
		mint cur = x[i] * y[i];
		mint next = x[i] * dp[i + 1];
		if (cur.data > next.data) {
			dp[i] = cur;
		} else {
			dp[i] = next;
		}
	}
	return dp[0].data;
}

int init(int N, int X[], int Y[]) {
	n = N;
	x.resize(n);
	y.resize(n);
	for (int i = 0; i < n; i++) {
		x[i] = X[i];
		y[i] = Y[i];
	}
	return calc();
}

int updateX(int pos, int val) {	
	x[pos] = val;
	return calc();
}

int updateY(int pos, int val) {
	y[pos] = val;
	return calc();
}