import java.util.*;

public class Main {

    static Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
        int s = sc.nextInt();

        int i = 1;
        int a = s;
        HashSet<Integer> nums = new HashSet<>();
        nums.add(a);
        while (true) {
            i++;
            if (a % 2 == 0) {
                a /= 2;
            } else {
                a = 3 * a + 1;
            }
            if (nums.contains(a)) {
                System.out.println(i);
                return;
            }
            nums.add(a);
        }
    }
}
/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