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

public class Main {
    public static void main(String[] args) throws Exception {
        int s = new Scanner(System.in).nextInt();
        int i = 0;
        List<Integer> a = new ArrayList<>();
        for (int j = s; !a.contains(j); i++) {
            a.add(j);
            j = j % 2 == 0 ? j / 2 : j * 3 + 1;
        }
        System.out.println(i + 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