using System;

namespace ConsoleApp2
{
    class Program
    {
        static void Main(string[] args)
        {


            double score = double.Parse(Console.ReadLine());
            if (score<=10)
            {
                Console.WriteLine("slow");
            }
            else if (score >10 && score<=50)
            {
                Console.WriteLine("average");
            }
            else if (score>50 && score<=150)
            {
                Console.WriteLine("fast");
            }
            else if (score>150 && score <=1000)
            {
                Console.WriteLine("ultra fast");
            }
            else
            {
                Console.WriteLine("extremely fast");
            }

        }

    }
}