using System; using System.Collections.Generic; using System.Text; using System.Linq; class Program { public void Proc() { Reader.IsDebug = false; long[] inpt = Reader.ReadLine().Split(' ').Select(a=>long.Parse(a)).ToArray(); long ans = (inpt[0] % inpt[3]) + (inpt[1] % inpt[3]) + (inpt[2] % inpt[3]); ans = ans % inpt[3]; Console.WriteLine(ans); } public class Reader { public static bool IsDebug = true; private static String PlainInput = @" 2 2 2 2 "; 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(); } } } static void Main() { Program prg = new Program(); prg.Proc(); } }