#include <stdio.h>
#include <stdlib.h>

void main(void){
	int score = 0;
	char result[100] = "a";
	scanf("%s",result);
	for(int i = 0 ; i < 9 ; i++){
		if(result[i] == '0'){
			score += 10;
		}else{
			score += result[i] - '0';
		}
	}
	printf("%d",score);
}