SpeedInfo

using System;

namespace SpeedInfo
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] data = { "slow", "average", "fast", "ultra fast", "extremely fast" };
            double speed = double.Parse(Console.ReadLine());
            if (speed>1000)
            {
                Console.WriteLine(data[4]);
            }
            else if (speed>150&&speed<=1000)
            {
                Console.WriteLine(data[3]);
            }
            else if (speed>50&&speed<=150)
            {
                Console.WriteLine(data[2]);
            }
            else if (speed>10&&speed<=50)
            {
                Console.WriteLine(data[1]);
            }
            else
            {
                Console.WriteLine(data[0]);
            }
        }
    }
}