PAT乙

import java.util.Scanner;


public class Basic1001 {
    public static void main(String[] args) {

        Scanner in = new Scanner(System.in);
        int number = in.nextInt();

        int counts = 0;
        while (number != 1) {
            if (number % 2 == 0) {
                number = number / 2;
            } else {
                number = (3 * number + 1) / 2;
            }
            counts++;
        }
        System.out.println(counts);
    }
}