using System;

public class Program

{

    public static void Main()

    {

        checkAge(19);

    }

    static void checkAge(int age)

    {

     if (age < 18)

     {

       throw new ArithmeticException("Access denied - You must be at least 18 years old.");

     }

     else

     {

       Console.WriteLine("Access granted - You are old enough!");

     }

    } 

}