#include <bits/stdc++.h>
using namespace std;

#define MOD (1000000000+7)

int main()
{
	int n;
	cin >> n;
	vector<long long> a( n + 1 );
	for( int i = 0; i < n + 1; i++ ) {
		cin >> a[i];
	}
	vector<long long> b( n + 1 );
	for( int i = 0; i < n + 1; i++ ) {
		cin >> b[i];
	}

	vector<long long> bsum( n + 2 );
	for( int i = 0; i < n + 1; i++ ) {
		bsum[i + 1] = bsum[i] + b[i];
		bsum[i + 1] %= MOD;
	}
	long long ans = 0;
	for( int i = 0; i < n + 1; i++ ) {
		ans += a[i] * bsum[n - i + 1] % MOD;
		ans %= MOD;
	}

	cout << ans << endl;
}