using System; using System.Collections.Generic; using System.Text; using System.Linq; class Program { public void Proc() { Reader.IsDebug = false; string[] inpt = Reader.ReadLine().Split(' '); long h = long.Parse(inpt[0]); long w = long.Parse(inpt[1]); long ninzu = long.Parse(inpt[2]); long target = long.Parse(inpt[3]); long blockCount = h*w; long make = blockCount % ninzu; if(make == 0) { make = ninzu; } string ans = (make == target)?"YES":"NO"; Console.WriteLine(ans); } public class Reader { public static bool IsDebug = true; private static String PlainInput = @" 1 2 2 1 "; private static System.IO.StringReader Sr = null; public static string ReadLine() { if (IsDebug) { if (Sr == null) { Sr = new System.IO.StringReader(PlainInput.Trim()); } return Sr.ReadLine(); } else { return Console.ReadLine(); } } public static int[] GetInt(char delimiter = ' ', bool trim = false) { string inptStr = ReadLine(); if (trim) { inptStr = inptStr.Trim(); } string[] inpt = inptStr.Split(delimiter); int[] ret = new int[inpt.Length]; for (int i = 0; i < inpt.Length; i++) { ret[i] = int.Parse(inpt[i]); } return ret; } } static void Main() { Program prg = new Program(); prg.Proc(); } }