#include <iostream>

using namespace std;

using ll = long long;

const ll MOD = 1e9 + 7;

int main() {
    int N;
    cin >> N;

    ll a[N + 1];
    for (int i = 0; i <= N; ++i) {
        cin >> a[i];
    }

    ll bsum[N + 1];
    cin >> bsum[0];
    for (int i = 1; i <= N; ++i) {
        ll b;
        cin >> b;
        bsum[i] = (bsum[i - 1] + b) % MOD;
    }

    ll ans = 0;
    for (int i = 0; i <= N; ++i) {
        ans += a[i] * bsum[N - i];
        ans %= MOD;
    }

    cout << ans << endl;
    return 0;
}