using System;

namespace yukicoder
{
    class Program
    {
        static void Main(string[] args)
        {
            string s = Console.ReadLine();
            int[] a =new int[9];
            int sum = 0;
            for(int i = 0; i < 9; i++)
            {
                a[i] = int.Parse(s.Substring(i,1));
            }
            for(int j = 0; j < 9; j++)
            {
                if (a[j] == 0)
                {
                    a[j] = 10;
                }
                sum += a[j];
            }
            Console.WriteLine(sum);
        }
    }
}