import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int s = sc.nextInt();
		Map<Integer,Integer> a = new HashMap<Integer,Integer>();
		int count = 1;

		a.put(s,0);

		while(true) {
			count++;
			if(s%2==0) {
				s = s/2;
			}
			else {
				s = s*3+1;
			}
			if(a.containsKey(s)) {
				System.out.println(count);
				break;
			}
			else {
				a.put(s,0);
			}
		}
	}

}
/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