import java.util.*;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int s = Integer.parseInt(sc.next());
        List<Integer> list = new ArrayList<>();
        int i= 1;
        list.add(s);
        while(true) {
            i++;
            if(s % 2 == 0) {
                s /= 2;
                if(list.contains(s)) {
                    System.out.println(i);
                    break;
                }else {
                    list.add(s);
                }
            }else {
                s = 3*s+1;
                if(list.contains(s)) {
                    System.out.println(i);
                    break;
                }else {
                    list.add(s);
                }
            }
        }
        
    }
}
/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