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

#define ll long long

const ll mod = 1e9 + 7;

void solve() {
    ll n;
    cin >> n;
    ll height = 0, width = 0;
    for(int i = 0; i < n; ++i) cin >> height;
    for(int i = 0; i < n; ++i) {
        ll x;
        cin >> x;
        width += x;
        width %= mod;
    }
    height = ((height * (height + 1)) / 2) % mod;
    width = ((width * (width + 1)) / 2) % mod;
    ll ans = (height * width) % mod;
    cout << ans << "\n";
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    solve();
    return 0;
}