#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;
const int MOD = (int)1e9 + 7;

int main() {
    int n; cin >> n;
    vector<int> a(n + 1), b(n + 1);
    for (int &ai: a) cin >> ai;
    for (int &bi: b) cin >> bi;
    vector<int> acc_b(n + 2);
    for (int i = 0; i <= n; i++) (acc_b[i + 1] = acc_b[i] + b[i]) %= MOD;
    int sum = 0;
    for (int i = 0; i <= n; i++) {
        (sum += 1LL * a[i] * acc_b[n - i + 1] % MOD) %= MOD;
    }
    cout << sum << endl;
    return 0;
}