using System;

public class Program

{

    public static void Main()

    {

        int n,ah,ash,m,aa;

        Console.WriteLine("enter the number");

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

        ah=n%10;

        ash=(n%100)/10;

        m=(n/100)%10;

        aa=n/1000;

        Console.WriteLine("the sum of the number is={0}", ah+ash+m+aa);

    }

}