using System;

public class Program

{

    public static void Main()

    {

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

        if (speed <= 10)

        Console.WriteLine("slow");

        else 

        if (speed <= 50)

        Console.WriteLine("average");

        else

        if (speed <= 100)

        Console.WriteLine("fast");

        else

        if (speed <= 150)

        Console.WriteLine("ultra fast");

        else

        if (speed <= 1000)

        Console.WriteLine("extremely fast");

    }

}