Speed

using System;

class Speed
{
    static void Main(string[] args)
    {
        int speed = int.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("extremely fast");
        }
    }
}