#include <iostream>
#include <vector>
using namespace std;
const long long MOD = 1000000007;
int main(){
	int n;
	cin >> n;
	vector<long long> a(n + 1);
	for (int i = 0; i <= n; i++){
		cin >> a[i];
	}
	vector<long long> b(n + 1);
	for (int i = 0; i <= n; i++){
		cin >> b[i];
	}
	vector<long long> S(n + 2);
	S[0] = 0;
	for (int i = 0; i <= n; i++){
		S[i + 1] = (S[i] + b[i]) % MOD;
	}
	long long ans = 0;
	for (int i = 0; i <= n; i++){
		ans += a[i] * S[n + 1 - i] % MOD;
	}
	ans %= MOD;
	cout << ans << endl;
}