#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int main() {
  int n; cin >> n;
  vector<int> a(n + 1), b(n + 1);
  vector<ll> sum(n + 1);
  for (int i = 0; i < n + 1; i++) cin >> a[i];
  for (int i = 0; i < n + 1; i++) cin >> b[i];
  sum[0] = a[0];
  for (int i = 1; i < n + 1; i++) sum[i] = (sum[i - 1] + a[i]) % 1'000'000'007;
  ll ans = 0;
  for (int i = 0; i < n + 1; i++) {
    ans += (sum[n - i] * b[i]) % 1'000'000'007;
    ans %= 1'000'000'007;
  }
  cout << ans << endl;
  return 0;
}