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

class yuki320
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    static void Main()
    {
        var c = NList;
        var (x, a, y, b) = (c[0], c[1], c[2], c[3]);

        var xp = PDiv(x);
        var yp = PDiv(y);
        foreach (var kv in yp)
        {
            if (!xp.ContainsKey(kv.Key) || xp[kv.Key] * a < kv.Value * b)
            {
                WriteLine("No");
                return;
            }
        }
        WriteLine("Yes");
    }
    static Dictionary<long, long> PDiv(long n)
    {
        var dic = new Dictionary<long, long>();
        var tmp = n;
        while (tmp % 2 == 0)
        {
            tmp /= 2;
            if (dic.ContainsKey(2)) ++dic[2];
            else dic.Add(2, 1);
        }
        for (var p = 3L; p * p <= n; p += 2)
        {
            while (tmp % p == 0)
            {
                tmp /= p;
                if (dic.ContainsKey(p)) ++dic[p];
                else dic.Add(p, 1);
            }
            if (tmp == 1) break;
        }
        if (tmp > 1) dic.Add(tmp, 1);
        return dic;
    }
}