import java.util.*;
public class Main {
	public static void main(String[] args){
      Scanner sc = new Scanner(System.in);
      
      int input = sc.nextInt();
      int count = 1;
      ArrayList<Integer>array = new ArrayList<Integer>();
      int newNum = 0;
      
      while(true){
        if(count==1){
          newNum = input;
        }else{
          int num = array.get(array.size()-1);
          if(num%2==0){
            newNum= num/2;
          }else{
            newNum= num*3+1;
          }
        }
        if(array.contains(newNum)){
          break;
        }else{
          array.add(newNum);
          count++;
        }
      }
      System.out.println(count);
	}
}
/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