/*
　　按照题目要求来就行
*/
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int steep = 0;
        while(n != 1){
            ++ steep;
            n = n % 2 == 0 ? n /2 : (3 * n + 1) / 2;
        }
        System.out.println(steep);
    }

}