using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please enter a number: ");

        string num = Console.ReadLine();

        int i_num = Convert.ToInt32(num);

        int len = num.Length;

        int[] nums = new int[len];

        int sum = 0;

        int count = 0;

        while (count < len) {

            nums[count] = i_num % 10;

            i_num /= 10;

            count++;

        }

        for (int i = 0; i < len; i++)

            sum += nums[i];

        Console.WriteLine(sum);

    }

}