using System;

public class Program

{

    public static void Main()

    {

        int the_number,a,b,c,d;

        Console.WriteLine("enter the number you want");

          the_number=int.Parse(Console.ReadLine());

        a=the_number/1000;

        b=(the_number/10%10);

        c=the_number%100/10;

        d=the_number%10;

        int digitnum=a+b+c+d;

        Console.WriteLine("THE SUM of the digits is {0}",digitnum);

    }

}