#include <stdio.h>

const int mod = 1000000007;
int N,A[100100],S;

int main()
{

	scanf ("%d",&N);
	for (int i=0;i<=N;i++){
		scanf ("%d",&A[i]);
		S = (S + A[i]) % mod;
	}

	int ans = 0;
	for (int i=0;i<=N;i++){
		int x; scanf ("%d",&x);
		ans = (ans + (long long)S * x) % mod;
		S = (S - A[N-i] + mod) % mod;
	}

	printf ("%d\n",ans);

	return 0;
}