/* 
  Copyright (c) 2020 Marek Küthe
  This program is free software. It comes without any warranty, to
  the extent permitted by applicable law. You can redistribute it
  and/or modify it under the terms of the Do What The Fuck You Want
  To Public License, Version 2, as published by Sam Hocevar. See
  http://www.wtfpl.net/ for more details.
*/

import java.util.InputMismatchException;
import java.util.Scanner;

public class CollatzConjecture {

	public static void main(String[] args) {

		int startNum = 0;

		if (args.length >= 1) {
			try {
				startNum = Integer.parseInt(args[0]);
			} catch (NumberFormatException e) {
				System.err.println(
						"Error: The number supplied as a command line argument could not be recognized as such.");
				System.exit(1);
			}
		} else {
			try (Scanner scanner = new Scanner(System.in)) {
				startNum = scanner.nextInt();
			} catch (InputMismatchException e) {
				System.err.println("Error: The number entered was not recognized.");
				System.exit(1);
			} catch (Exception e) {
				System.err.println("Error: " + e.getMessage());
				e.printStackTrace(System.err);
				System.exit(1);
			}
		}

		int workNum = startNum;
		int counter = 0;

		while (workNum != 1) {
			if (workNum % 2 == 0) {
				System.out.print(workNum + " / 2 = ");
				workNum = workNum / 2;
				System.out.println(workNum);
			} else {
				System.out.print(workNum + " * 3 + 1 = ");
				workNum = workNum * 3 + 1;
				System.out.println(workNum);
			}
			counter++;
		}

		System.out.println("The program was able to reach the number " + workNum + " in " + counter + " "
				+ (counter == 1 ? "round" : "rounds") + "!");

	}

}