#include<algorithm>
#include<iostream>
#include<vector>
using namespace std;
typedef long long lint;
typedef vector<int>vi;
typedef pair<int,int>pii;
#define rep(i,n)for(int i=0;i<(int)(n);++i)

const int N=110000;
lint a[N],b[N];
const lint mo=1000000007;
int main(){
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin>>n;
  rep(i,n+1)cin>>a[i];
  rep(i,n+1)cin>>b[i];
  rep(i,N-1)b[i+1]=(b[i]+b[i+1])%mo;
  lint c=0;
  rep(i,N)c=(c+a[i]*b[n-i])%mo;
  cout<<c<<endl;
}