using System;

public class Hello
{
    static void Main()
    {
        var s = Console.ReadLine().Trim();
        getAns(s);
    }
    static void getAns(string s)
    {
        if (s[0] == '-') { Console.WriteLine(0); return; }
        var sL = s.Length;
        if (sL <= 2) { Console.WriteLine(0); return; }
        Console.WriteLine(s.Substring(0, sL - 2));
    }
}