
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);
        int s = sc.nextInt();
        Set<Integer> set = new HashSet<>();
        set.add(s);
        s = s % 2 == 0 ? s / 2: s * 3 + 1;
        while (!set.contains(s)) {
            set.add(s);
            s = s % 2 == 0 ? s / 2: s * 3 + 1;
        }
        System.out.println(set.size()+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