using System.Collections.Generic;
using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var x = long.Parse(line[0]);
        var a = long.Parse(line[1]);
        var y = long.Parse(line[2]);
        var b = long.Parse(line[3]);
        Console.WriteLine(getAns(x, a, y, b) ? "Yes" : "No");
    }
    static bool getAns(long x, long a, long y, long b)
    {
        var d = PF(x);
        var d2 = PF(y);
        foreach (var t in d2)
        {
            if (!d.ContainsKey(t.Key)) return false;
            var bb = t.Value * b;
            var aa = d[t.Key] * a;
            if (aa < bb) return false;
        }
        return true;
    }

    static Dictionary<long, long> PF(long n)
    {
        var d = new Dictionary<long, long>();
        for (long i = 2; i * i <= n; i++)
        {
            if (n % i != 0) continue;
            var x = 0L;
            while (n % i == 0)
            {
                x++;
                n /= i;
            }
            d[i] = x;
        }
        if (n != 1) d[n] = 1;
        return d;
    }
}