using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace Con10a

{

    class Program

    {

        static void Main(string[] args)

        {

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

            if (speed <= 10) 

            {

                Console.WriteLine("slow");

            } else if (speed <= 50)

            {

                Console.WriteLine("average");

            } else if(speed <= 150)

            {

                Console.WriteLine("fast");

            } else if(speed <= 1000)

            {

                Console.WriteLine("ultra fast");

            } else

            {

                Console.WriteLine("extremel fast");

            }

        }

    }

}