using System;

public class Program

{

    public static void Main()

    {

        //david prieto

        int a, b, c;

        Console.WriteLine("write a number.");

        a = int.Parse(Console.ReadLine());

        Console.WriteLine("Please write another number.");

        b = int.Parse(Console.ReadLine());

        Console.WriteLine("Please write another number.");

        c = int.Parse(Console.ReadLine());

        if ( a == b || a == c || b == c)

        {

            Console.WriteLine("The numbers must be different, please start again.");

        }

        else if (b > a && a > c)     // y x z

        {

            Console.WriteLine("The middle number is: " +a);

        }

        else if (c > a && a > b)    // z x y

        {

            Console.WriteLine("The middle number is: " +a);

        }

        else if ( a > b && b > c) // x y z

        {

            Console.WriteLine("The middle number is: " +b);

        }

        else if ( c > b && b > a) // z y x

        {

            Console.WriteLine("The middle number is: " +b);

        }

        else if (a > c && c > b) // x z y 

        {

            Console.WriteLine("The middle number is: " +c);

        }

        else if (b > c && c > a) // y z x

        {

            Console.WriteLine("The middle number is: " +c);

        }

        //Es incorrecto poner x > y > z la manera correcta de escribirlo es x > y && y > z

    }

}