import java.util.Scanner;

import static java.lang.Double.*;

/**
 * Created by jonh on 1/16/2017.
 */
public class Speed_test {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        double speed = Double.parseDouble(scanner.nextLine());

        if (speed < 0.0 == speed >= 11.0) {
            System.out.println("slow");

        } else if (speed < 11.0 == speed >= 51.0) {
            System.out.println("average");

        } else if (speed < 51.0 == speed >= 151.0) {
            System.out.println("fast");

        } else if (speed < 151.0 == speed >= 1001.0) {
            System.out.println("ultra fast");

        }
          else if (speed > 1001.0) {
            System.out.println("extremely fast");

        }

    }
}