SumaCyfr4

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SumaCyfr
{
    class Program
    {
        static void Main(string[] args)
        {
            /* string str = Console.ReadLine();
            uint a= uint.Parse(str);
            uint b=0;
            A:
            b += a % 10;
            a /= 10;
            if (a > 0) goto A;
            Console.WriteLine(b);
            Console.ReadKey(); */

            string str = Console.ReadLine();
            uint a = uint.Parse(str);
            uint b = 0;
            while (true)
            {
                b += a % 10;
                a /= 10;
                if (a <= 0) break;
            }
            Console.WriteLine(b);
            Console.ReadKey();
        }
    }
}