#include <bits/stdc++.h>
using namespace std;

int main() {
    constexpr int64_t mod = 1000000007;
    int n;
    cin >> n;
    vector<int64_t> a(n + 1), b(n + 1), s(n + 2);
    for (int i = 0; i <= n; i++) cin >> a.at(i);
    for (int i = 0; i <= n; i++) cin >> b.at(i);
    for (int i = 0; i <= n; i++) {
        s.at(i + 1) = (s.at(i) + a.at(i)) % mod;
    }
    int64_t ans = 0;
    for (int i = 0; i <= n; i++) {
        ans += s.at(i + 1) * b.at(n - i);
        ans %= mod;
    }
    cout << ans << endl;
}