import java.util.*;

// given an integer up to 9999, sum the individual digits (e.g., 9999 = 9 + 9 + 9 + 9 = 36)

public class Prog2_6
{
	public static void main(String[] args)
	{
		Scanner in = new Scanner(System.in);			// keyboard input
		int number;
		System.out.print("Enter the number (0-9999): ");	// prompt user for input
		number = in.nextInt();
		int sum = number % 10;							// initialize sum to rightmost digit
		number = number / 10;							// remove this digit
		sum += number % 10;								// add next digit to sum
		number = number / 10;							// remove that digit
		sum += number % 10;								// add next digit to sum
		number = number / 10;							// remove that digit
		sum += number;
		System.out.println("The sum of the digits is " + sum);
	}
}