#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 sum1 = 0;
  for(int i=0;i<=n;++i){
    for(int j=0;j<=i;++j){
      sum1 += a[i]*b[i-j];
      sum1 %= mod;
    }
  }
  /*
  i64 sum2 = 0;
  for(int i=0;i<=n;++i){
    for(int j=0;j<=n-i;++j){
      sum2 += a[i]*b[j];
      sum2 %= mod;
    }
  }
  */

  cout<<(sum1)<<endl;
  //cout<<(sum2)<<endl;

}