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

const int M = int(1e9 + 7);

signed main() {
  ios::sync_with_stdio(false);

  int N;
  cin >> N;

  vector<int> A(N + 1);
  for (int i = 0; i < N + 1; ++i) cin >> A[i];

  vector<int> B(N + 1);
  for (int i = 0; i < N + 1; ++i) cin >> B[i];

  vector<int> bsum(N + 2);
  partial_sum(B.begin(), B.end(), bsum.begin() + 1,
              [](int s, int x) { return (s + x) % M; });

  int ans = 0;
  for (int i = 0; i < N + 1; ++i)
    (ans += 1LL * A[i] * bsum[N + 1 - i] % M) %= M;

  if (ans < 0) ans += M;
  cout << ans << endl;

  return 0;
}