SumDigitsofNumber

import java.util.Scanner;

/**
 * Created by Jo on 2/21/2017.
 */
public class SumDigitis {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        int number = Integer.parseInt(console.nextLine());
        int tempNumber = 0;
        int sum = 0;

        do {
            tempNumber = number % 10;
            sum += tempNumber;
            number = number / 10;
        } while (number !=0);
        System.out.println(sum);

    }
}