#include <bits/stdc++.h>
using namespace std;
const int score[10] = {10, 1, 2, 3, 4, 5, 6, 7, 8, 9};

int main() {
    int ans = 0;
    string s;
    cin >> s;
    for (const char &c : s) ans += score[c - '0'];
    cout << ans << endl;
    return 0;
}