#include <bits/stdc++.h>
#define N 1000000007
using namespace std;

long long n;
long long a[100005] = {0};
long long b[100005] = {0};

long long solve();

int main() {
  cin >> n;
  for(int i = 0; i <= n; ++i) cin >> a[i];
  for(int i = 0; i <= n; ++i) {
    cin >> b[i];
    if(i != 0) b[i] += b[i - 1];
    b[i] %= N;
  }

  cout << solve() << endl;
  return 0;
}

long long solve() {
  long long ans = 0;
  for(int i = 0; i <= n; ++i) {
    ans += a[i] * b[n - i] % N;
    ans %= N;
  }
  return ans;
}