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

int main(){
    int i, cnt = 0;
    char point;

    for(i = 0; i < 9; i++){
        scanf("%c", &point);
        if(point != '0'){
            cnt += atoi(&point);
        }else{
            cnt += 10;
        }
    }
    printf("%d\n", cnt);

    return 0;
}