using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace yukicoder_166 {
    class Program {
        static void Main(string[] args) {
            string[] s = Console.ReadLine().Split(' ');
            decimal[] d = new decimal[4];
            for (int i = 0; i < 4; i++) {
                d[i] = decimal.Parse(s[i]);
            }
            decimal masu = d[0] * d[1];
            if ((masu - d[3]) % d[2] == 0) Console.WriteLine("YES");
            else Console.WriteLine("NO");
            Console.ReadLine();
        }
    }
}