using System;
public class Program
{
public static void Main()
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("extremely fast");