#include <bits/stdc++.h>
using namespace std;

int ctoi(char &c){
    switch(c){
        case '1': return 1;
        case '2': return 2;
        case '3': return 3;
        case '4': return 4;
        case '5': return 5;
        case '6': return 6;
        case '7': return 7;
        case '8': return 8;
        case '9': return 9;
        default: return 0;
    }
}

int main() {
    string s;
    cin >> s;

    int sum = 0;
    for(int i = 0; i < s.size(); i++){
        sum += ctoi(s.at(i));
    }

    cout << sum << endl;
}