using System;

public class Program

{

    public static void Main()

    {

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

        if (speed <= 10)

        {

            Console.WriteLine("slow");

        }

        else if ((speed > 10) && (speed <= 50))

        {

            Console.WriteLine("average");

        }

        else if ((speed > 50) && (speed <= 150))

        {

            Console.WriteLine("fast");

        }

        else if ((speed > 150) && (speed <= 1000))

        {

            Console.WriteLine("ultra fast");

        }

        else if (speed > 1000)

        {

            Console.WriteLine("extremely fast");

        }

    }

}