import java.util.*;
public class Main {
   public static void main(String[] args) {  
      Scanner sc = new Scanner(System.in);
      
      int a = sc.nextInt();
      HashSet<Integer> hs = new HashSet<Integer>();
      while(!hs.contains(a)) {
         hs.add(a);
         if(a % 2 == 1) {
            a = 3 * a + 1;
         }
         else {
            a /= 2;
         }
      }
      System.out.println(hs.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