#define _USE_MATH_DEFINES
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
using namespace std;
typedef long long ll;
const int mod=1e9+7;
int main(){
	int n,a[100001],b;
	cin>>n;
	int sum=0;
	for(int i=0;i<=n;i++){
		cin>>a[i];
		(sum+=a[i])%=mod;
	}
	int ans=0;
	for(int i=0;i<=n;i++){
		cin>>b;
		(ans+=(ll)b*sum%mod)%=mod;
		(sum+=mod-a[n-i])%=mod;
	}
	cout<<ans<<endl;
}