using System;

​

public class Program

{

    public static void Main()

    {

        {

            int num = 10;

            int found = 0;

            while (found == 0 && num < 100)

            {

                int ones = num % 100;

                int tens = num / 10;

                if ((tens + ones == 7) && (tens == ones + 3))

                {

                    Console.WriteLine("lowest number: " + num);

                    found = 1;

                }

​

                num = num + 1;

            }

​

            num = 99;

            found = 0;

            while (found == 0 && num >= 10)

            {

                int ones = num % 100;

                int tens = num / 10;

                if ((tens + ones == 7) && (tens == ones + 3))

                {

                    Console.WriteLine("highest number: " + num);

                    found = 1;

                }

​

                num = num - 1;

            }

        }

    }

}