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("ultraspeed");

        }

        else

        {

        Console.WriteLine("extremely fast");

        }

    }

}