Speed info

using System;


namespace SpeedInfo
{
    class SpeedInfo
    {
        static void Main()
        {
            double speed = double.Parse(Console.ReadLine());

            if (speed > 1000)
            {
                Console.WriteLine("extremely fast");
            }
            else if (speed <= 1000 && speed > 150)
            {
                Console.WriteLine("ultra fast");
            }
            else if (speed <= 150 && speed > 50)
            {
                Console.WriteLine("fast");
            }
            else if (speed <= 50 && speed > 10)
            {
                Console.WriteLine("average");
            }
            else if (speed <= 10 && speed >= 0)
            {
                Console.WriteLine("slow");
            }
            else if (speed <0)
            {
                Console.WriteLine("slow");
            }
        }
    }
}