import java.util.ArrayList;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner reader = new Scanner(System.in);
		int S = reader.nextInt();
		reader.close();
		ArrayList<Integer> list = new  ArrayList<Integer>();
		int count = 1;
		while (!list.contains(S)) {
			list.add(S);
			if (S % 2 == 0) {
				S /= 2;
			} else {
				S = 3 * S + 1;
			}
			count++;
		}
		System.out.print(count);
	}
}


/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz