#include <bits/stdc++.h>

using namespace std;

using ll = long long;

const ll MOD = 1000000007;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int n;
    cin >> n;
    vector<ll> a(n + 1);
    ll s = 0;
    for (int i = 0; i <= n; i++) {
        cin >> a[i];
        (s += a[i]) %= MOD;
    }

    ll ans = 0;
    for (int i = 0; i <= n; i++) {
        ll x;
        cin >> x;
        (ans += x * s % MOD) %= MOD;
        (s += MOD - a[n - i]) %= MOD;
    }
    cout << ans << endl;
    return 0;
}