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