using System;

public class Program

{

    public static void Main()

    {

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

        if(n<=10){

            Console.WriteLine("slow");

        } else if(n>10 && n<=50){

            Console.WriteLine("average");

        } else if(n>50 && n<=150){

            Console.WriteLine("fast");

        } else if(n>150 && n<=1000){

            Console.WriteLine("ultra fast");

        } else {

            Console.WriteLine("Extremely fast");

        }

    }

}