#include <bits/stdc++.h>

int main()
{
    char scores[9];
    int score_sum=0;
    std::cin >> scores;
    for(int i=0;i<9;i++){
        int si = atoi(&scores[i]);
        if(si==0)
            score_sum += 10;
        else
            score_sum += si;
    }
    std::cout << score_sum << std::endl;
}