using System;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int count=0;

        for(int i=0; i<1000000; i++)

        {

            string s = i.ToString();

            if(s.ToCharArray().Reverse().SequenceEqual(s.ToCharArray()))

                count++;

        }

        Console.WriteLine(count);

    }

}