1001

package com.company;

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // write your code here
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int i=0;
        for (;;i++){
            if(n%2==0){
                n=n/2;
            }
            else {
                if (n == 1) {
                    break;
                }
                else {
                    n = (3 * n + 1)/2;
                }


            }
        }
        System.out.println(i);

        }



    }