// SumDigits - print out the sum of an integer's digits

import java.util.Scanner;

public class SumDigits {

	public static void main(String[] args) {
		int x;
		Scanner input = new Scanner(System.in);

		System.out.print("Please enter an integer: ");
        x = input.nextInt();
        int result = sumDigits(x);
        System.out.println(result);
        
	}
	
	public static int sumDigits(int x) {
		if (x < 10) {
			return x;
		} else {
			return x%10 + sumDigits(x/10);
		}
	}

}