import java.util.*;

public class Main{
  public static void main(String[]args){
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    
    Set<Integer> set = new HashSet<>();
    set.add(n);
    while(true){
      int m = set.size();
      if(n%2 == 0){
        n /= 2;
      }else{
        n = n*3+1;
      }
      set.add(n);
      
      if(set.size() == m){
        break;
      }
    }
    System.out.println(set.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