using System;

public class Program

{

    public static void Main()

    {

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

        Sum(num);

    }

    static void Sum(int n)

    {

        int sum=0;

        int m =;

        while(n>0)

        {

            m=n%10;

            sum=sum+m;

            n=n/10;

        }

        Console.WriteLine("sum={sum}");

     }