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

#define rep(i,n) for(int i=0;i<int(n);++i)
using i64 = int64_t;
constexpr i64 mod = 1e9+7;

signed main(){

  int n;
  cin>>n;
  if(n>1e4)return 1;
  vector<i64> a(n+1),b(n+1);
  rep(i,n+1)cin>>a[i];
  rep(j,n+1)cin>>b[j];

  i64 sum = 0;
  for(int i=0;i<=n;++i){
    for(int j=0;j<=n-i;++j){
      sum += a[i]*b[j];
      sum %= mod;
    }
  }

  cout<<(sum)<<endl;

}