using System;

public class Program

{

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!");

}

}

public static void Main(string[] args)

{

checkAge(15);

}

}

​