import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		Set<Integer> arrays=new HashSet<>();
		int cnt=1;
		int s=sc.nextInt();
		arrays.add(s);

		while(true) {
			cnt++;
			s=result(s);
			if(arrays.contains(s)) {
				System.out.println(cnt);
				break;
			}
			arrays.add(s);
		}
	}
	public static int result(int a) {
		if(a%2==0) {
			return a/2;
		}
		return 3*a+1;
	}

}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz