using System;

public class Program

{

    public static void Main()

    {

        int s = int.Parse(Console.ReadLine());

        if (s <= 10) Console.WriteLine("slow");

        else if (s <= 50) Console.WriteLine("average");

        else if (s<=150) Console.WriteLine("fast");

        else if(s<=1000) Console.WriteLine("ultra fast");

        else Console.WriteLine("extremely fast");

​

    }

}