import java.util.*;

public class Main {
    static final int MOD = 1000000007;
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt() + 1;
        int[] as = new int[n];
        long sum = 0;
        for (int i = 0; i < n; i++) {
            as[i] = sc.nextInt();
            sum += as[i];
        }
        sum %= MOD;
        long ans = 0;
        for (int i = 0; i < n; i++) {
            int x = sc.nextInt();
            ans += sum * x % MOD;
            ans %= MOD;
            sum += MOD - as[n - i - 1];
            sum %= MOD;
        }
        System.out.println(ans);
    }
}