#include <iostream>
using namespace std;
                                                                                                
  
int main(){


    int i;

    int k = 0;

    char m;


    for( i = 0 ; i < 9 ; i = i + 1 ){

        cin >> m;

        if( m == '0' ) k += 10;

        else k += m - '0';

        }
                                            

    cout << k << endl;

    return 0;

}