

import java.util.HashSet;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);

		int s = sc.nextInt();

		HashSet<Integer> set = new HashSet<Integer>();

		set.add(s);
		int i = 2;

		while(true){
			if(s % 2 == 0){
				s /= 2;
			}
			else {
				s = s*3 + 1;
			}

			if(set.contains(s)){
				System.out.println(i);
				return;
			}

			set.add(s);
			i++;
		}

	}

}

/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