using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        // No.166 マス埋めゲーム

        long[] hwnk = Console.ReadLine().Split(' ').Select(s => long.Parse(s)).ToArray();

        long tmp = hwnk[0] * hwnk[1] % hwnk[2];
        if (tmp == 0 || tmp == hwnk[3])
            Console.WriteLine("YES");
        else
            Console.WriteLine("NO");
    }
}