#include <bits/stdc++.h>

using namespace std;

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