SumDigits

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

namespace SumDigits
{
    class Program
    {
        static void Main()
        {
            string number = Console.ReadLine();
            int sum = 0;

            for (int i = 0; i <= number.Length - 1 ; i++)
            {
                if(number[i] == 0)
                {
                    sum += 0;
                }

               if(number[i] == '1')
                {
                    sum += 1;
                }

                if (number[i] == '2')
                {
                    sum += 2;
                }

                if (number[i] == '3')
                {
                    sum += 3;
                }

                if (number[i] == '4')
                {
                    sum += 4;
                }

                if (number[i] == '5')
                {
                    sum += 5;
                }

                if (number[i] == '6')
                {
                    sum += 6;
                }

                if (number[i] == '7')
                {
                    sum += 7;
                }

                if (number[i] == '8')
                {
                    sum += 8;
                }

                if (number[i] == '9')
                {
                    sum += 9;
                }
            }

            Console.WriteLine(sum);
        }
    }
}