using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Stack<int> stack =new Stack<int>();

​

stack.Push(int.Parse(Console.ReadLine()));

        while(stack.Peek()!=1)

        {

            if(stack.Peek()%2==0)

            {stack.Push(stack.Peek()/2);}

            else

             stack.Push(stack.Peek()*3+1);

        }

        Console.WriteLine(stack.Count);

    }

}