import java.util.ArrayList;
import java.util.Scanner;


public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		ArrayList<Integer> a = new ArrayList<>();
		int s = sc.nextInt();
		a.add(s);
		
		while(true) {
			if(s % 2 == 0) {
				s = s/2;
				a.add(s);
			}else {
				s = 3*s + 1;
				a.add(s);
			}
			for(int i = 0; i < a.size() - 1; i++) {
				for(int j = i+1; j < a.size(); j++) {
					if(a.get(i) == a.get(j)) {
						System.out.println(j+1);
						return;
					}
				}
			}
		}
	}

}

/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