#include <iostream>

int main()
{
    char in[11];
    
    std::cin >> in;
    
    int score = 0;
    for(int i = 0; i < 9; i++)
    {
        score += (in[i] == 0)? 10:in[i];
    }
    
    std::cout << score << std::endl;
    
    return 0;
}