#include <iostream>
using namespace std;

int main() {
    int score = 0;
    string s;

    cin >> s;
    for (int i = 0; i < 9; i++) {
        char c = s[i];
        if(c == '0'){
            score += 10;
        } else {
            score += c - '0';
        }
    }
    cout << score << endl;

    return 0;
}