using System;

public class Program

{

    public static void Main()

    {

        int z;

        Console.WriteLine("Hello, please give me your bowling score");

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

        if ( z > 300)

        {

        Console.WriteLine("That’s impossible, please start again.");    

        }

        else if ( z == 300)

        {

        Console.WriteLine("Perfect score!");    

        }

        else if ( z == 200 || z > 200)

        {

        Console.WriteLine("Great score!");  

        }

        else if ( z == 100 || z > 100)

        {

        Console.WriteLine("Good, you can do better!");  

        }

        else if ( z < 100 )

        {

        Console.WriteLine("Sorry, you are not good at bowling.");   

        }

    }

}