#include <iostream>
#include <string>
using namespace std;

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