import java.util.ArrayList;

import java.util.Scanner;

public class Main {



    public static void main(String[] args){

    	Scanner sc = new Scanner(System.in);



    	// 入力

    	int s = sc.nextInt();

    	ArrayList<Integer> arg = new ArrayList<>();
      	arg.add(s);

    	int i;



    	for (i = 0; i < 1000002; i++ ){

        	if(s % 2 == 0){

        		s = s / 2;

        	} else {

        		s = 3 * s + 1;

        	}



        	if (arg.contains(s)){

        		break;



        	}

        	arg.add(s);



    	}



    	// 出力

    	System.out.println(i+2);

    }

}
/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