using System;

public class Program

{

    public static void Main()

    {

        double speed= double.Parse(Console.ReadLine());

        if(speed <=10)

        {

        Console.WriteLine("slow");

        }

        else if(speed <=50)

        {

        Console.WriteLine("average");

        }

        else if(speed <=150)

        {

        Console.WriteLine("fast");

        }

        else if (speed <=1000)

        {

        Console.WriteLine("ultra fast");

        }

        else if(speed >=1000);

        {

        Console.WriteLine("extremely fast");

        }

    }

}

​

​

​