package net.ipipip0129.yukicoder.no656;

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		
		String line = scan.nextLine();
		
		scan.close();
		
		int score = 0;
		
		for (int i = 0; i < line.length(); i++) {
			int point = Integer.parseInt(line.substring(i, i + 1));
			if (point == 0) {
				score += 10;
			}else {
				score += point;
			}
		}
		
		System.out.println(score);
	}
}