#include <bits/stdc++.h>
using ll = long long;
constexpr ll MOD = 1e9 + 7;
int main()
{
    int N;
    std::cin >> N;
    std::vector<ll> a(N + 1), b(N + 1);
    for (int i = 0; i <= N; i++) std::cin >> a[i];
    for (int i = 0; i <= N; i++) std::cin >> b[i], b[i] += (i == 0 ? 0 : b[i - 1]);
    ll ans = 0;
    for (int i = 0; i <= N; i++) { (ans += a[i] * b[N - i] % MOD) %= MOD; }
    std::cout << ans << std::endl;
    return 0;
}