using System;

namespace ConsoleApp2
{
    class Program
    {
        static int Read()
        {/// intering numbers which x is 1000<=x<=9999 or else print "wrong" and exit the programm
            int numberreturn;
            bool number = int.TryParse(Console.ReadLine(), out numberreturn);
            if ( number && numberreturn>=1000 && 9999>=numberreturn)
            {
                return numberreturn;
            }
            else
            {
                Console.WriteLine("wrong");
                Environment.Exit(0);
                return 0;
            }


        }
        static void Main(string[] args)
        {/// input step
            int num = Read();
            /// write a number of one half x%100 and invert another num%10*10+num/10%10 and get 1 if 2 halfs are equal or any other number if they are not
            try
            {
                int numberalg = num / 100 / (num % 10 * 10 + num / 10 % 10);
                ///catch nums which are ok in the first tests because not int
                int numberalg2 = num / 100 % (num % 10 * 10 + num / 10 % 10);
                Console.WriteLine(numberalg+numberalg2);
            }
            /// if a half equal = 0
            catch
            {
                Console.WriteLine("666");
            }
        }
    }
}