using System;
namespace SpeedInfo
{
    class SpeedInfo
    {
        static void Main()
        {
            double speed = double.Parse(Console.ReadLine());
            if (speed <= 10)
            {
                Console.WriteLine("slow");
            }
            else if (speed > 10 && speed <= 50)
            		{
                		Console.WriteLine("average");
            		}
            else if (speed > 50 && speed <= 150)
            		{
                		Console.WriteLine("fast");
            		}
            else if (speed > 150 && speed <= 1000)
            		{
                		Console.WriteLine("ultra fast");
            		}
            else if (speed > 1000)
            		{
                		Console.WriteLine("extremely fast");
            		}
        }
    }
}