#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
using namespace std;


int main()
{
    long long n, mod, ans = 0, ad = 0, bd = 0;
    cin >> n;
    mod = 1e9+7;
    vector<long long> a(n+1), b(n+1);
    
    for (long long i = 0; i < n+1; i++){
        cin >> a[i];
        ad += a[i];
        ad %= mod;
    }
    for (long long i = 0; i < n+1; i++) cin >> b[i];
    for (long long i = 0; i < n+1; i++){
        ans += (ad * b[i])%mod;
        ans %= mod;
        ad += mod;
        ad -= a[n-i];
        ad %= mod;
    }
    cout << ans << endl;
}