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");

 }

​

    }

}

​