#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

#include <atcoder/modint>
using mint = atcoder::modint1000000007;

int main() {
  int n;
  cin >> n;
  vector<int> a(n + 1), b(n + 1);
  rep(i, n + 1) cin >> a[i];
  rep(i, n + 1) cin >> b[i];
  mint ans = 0, sum = accumulate(a.begin(), a.end(), mint(0));
  rep(i, n + 1) {
    ans += sum * b[i];
    sum -= a[n - i];
  }
  cout << ans.val() << endl;
  return 0;
}