PAT (B) 題目1001

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
//		int n = Integer.parseInt(sc.nextLine());
		int n = sc.nextInt();
		int count = 0;
		do {
			if(n%2!=0) {
				n = 3*n+1;
				n = n/2;
			}else {
				n = n/2;
			}//判斷奇偶性
			count++;
		}while(n!=1);
		System.out.print(count);
	}

}