#include <cstdio>
#include <cstdlib>
#include <cstddef>
#include <vector>
#include <algorithm>
#include <cmath>
#include <string>
#include <iostream>
#include <iomanip>
#define L64 long long
#define MOD (1000000007LL)

int main(void)
{
  L64 n;
  std::cin >> n;
  std::vector<L64> asum;
  asum.resize(n + 2);
  L64 tmp;
  std::cin >> tmp;
  asum[1] = tmp;
  for(L64 i = 2; i <= n + 1; i++){
    std::cin >> tmp;
    asum[i] = (asum[i - 1] + tmp) % MOD;
  }
  L64 sum = 0;
  for(L64 i = 1; i <= n + 1; i++){
    std::cin >> tmp;
    sum = (sum + (tmp * asum[n + 2 - i]) % MOD) % MOD;
  }
  std::cout << sum << std::endl;
}