using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static int[] NList => ReadLine().Split().Select(int.Parse).ToArray();
    static long[] LList(long n) => Enumerable.Repeat(0, (int)n).Select(_ => long.Parse(ReadLine())).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var a = LList(n + 1);
        var b = LList(n + 1);
        var ans = 0L;
        var mod = 1_000_000_007;
        var asum = 0L;
        for (var i = n; i >= 0; --i)
        {
            asum = (asum + a[n - i]) % mod;
            ans = (ans + b[i] * asum) % mod;
        }
        WriteLine(ans);
    }
}