#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;
  vector<i64> a(n+1),b(n+1);
  rep(i,n+1)cin>>a[i];
  rep(j,n+1)cin>>b[j];
  vector<i64> sumb(n+2);
  rep(i,n+1)sumb[i+1]=sumb[i]+b[i];

  i64 sum = 0;
  for(int i=0;i<=n;++i){
    sum += a[i]*(sumb[n-i+1]%mod)%mod;
    sum %= mod;
  }

  cout<<(sum)<<endl;

}