#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;
    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];
    for (long long i = 0; i < n+1; i++) cin >> b[i];
    for (long long i = 0; i < n+1; i++){
        for (int j = 0; j <= i; j++){
            ans += (a[j] * b[i-j])%mod;
            ans %= mod;
        }
    }
    cout << ans << endl;
}