#include <iostream>
#include <vector>
#include <algorithm>
#include <iterator>
#include <array>
#include <map>
#include <stack>
#include <queue>
#include <set>

using namespace std;

int main() {

    string S;
    cin >>S;

    int result = 0;
    for (int i = 0; i < 9; ++i) {
        int s = S[i] - '0';
        if(s == 0) {
            result+=10;
        } else {
            result+=s;
        }
    }

    cout << result << "\n";

    return 0;
}