using System;

public class Program

{

    public static void Main()

    {

        long r,sum=0;

        Console.WriteLine("enter the number");

        long n=Convert.ToInt64(Console.ReadLine());

        while (n!=0)

        {

            r=n%10;

            sum=sum+r;

            n=n/10;

        }

    Console.WriteLine("sum of the number is"+sum);

    }

}