#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios::sync_with_stdio(false); cin.tie(0);
  const int mod = 1e9 + 7;
  int n;
  cin >> n;
  n++;
  vector<int> a(n);
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  vector<long long> b(n + 1);
  for (int i = 0; i < n; i++) {
    int x;
    cin >> x;
    b[i + 1] = b[i] + x;
    b[i + 1] %= mod;
  }
  long long ans = 0;
  for (int i = 0; i < n; i++) {
    ans += (b[n - i] * a[i]) % mod;
    ans %= mod;
  }
  cout << ans << endl;
  return 0;
}