using System;

​

public class Program

{

    public static void Main()

    {

        int num = 1, count = 0, max = 0;

        while (num != 99)

        {

            num = 1;

            while (num < 10 || num > 99)

            {

                Console.WriteLine("Please enter a 2-digit number:");

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

            }

​

            if (num / 10 == 2 * (num % 10) || num % 10 == 2 * (num / 10))

            {

                count++;

                if (num > max)

                    max = num;

            }

        }

​

        Console.WriteLine(count + " numbers were found");

        Console.WriteLine(max + " is max");

    }

}