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

                Console.WriteLine("extremely fast");

    }

}