PAT1001

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        int n = input.nextInt();
        int count = 0;
        while(n!=1){
            count++;
            if(n%2==0){
                n=n>>1;
            }else{
                n=(3*n+1)>>1;
            }
        }
        System.out.println(count);
    }

}