using System;
using System.Collections.Generic;

class Program
{
    public void Solve()
    {
        string S = Console.ReadLine();
        int score = 0;
        foreach (var s in S)
        {
            score += int.Parse((s == '0' ? "10" : s.ToString()).ToString());
        }
        Console.WriteLine(score);
    }

    static void Main()
    {
        var solver = new Program();
        solver.Solve();
    }
}