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 void Main()
    {
        var n = NN;
        var a = NList;
        var b = NList;
        WriteLine(Work(n, a, b));
    }
    static long Work(int n, int[] a, int[] b)
    {
        var p = new List<int>();
        for (var i = 0; i < n; ++i) p.Add(i);
        p.Sort((l, r) =>
        {
            var d = (long)a[l] * (1 - b[r]) - (long)a[r] * (1 - b[l]);
            if (d > 0) return -1;
            else if (d < 0) return 1;
            else return 0;
        });
        var mod = 1_000_000_007;
        var res = 0L;
        var lv = 1L;
        foreach (var pi in p)
        {
            res = (res + lv * a[pi] % mod) % mod;
            lv = lv * b[pi] % mod;
        }
        return (res);
    }
}