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

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		int S, x;
		Scanner sc = new Scanner(System.in);
		Set<Integer> hash_set = new HashSet<Integer>();

		S = sc.nextInt();
		x = S;

		while(hash_set.contains(x) == false) {
			hash_set.add(x);

			if(x % 2 == 0) {
				x /= 2;
			} else {
				x = 3 * x + 1;
			}
		}

		System.out.println(hash_set.size() + 1);

		sc.close();
	}

}
/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