using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Please enter your age: ");

        int age = Convert.ToInt32(Console.ReadLine());

        if (age >= 18)

        {

            Console.WriteLine("You're now signed up!");

        }

        else if (age < 0)

        {

            Console.WriteLine("You haven't been born yet");

        }

        else

        {

            Console.WriteLine("Sorry, you're too young");

        }

    }

}