import java.util.*;

public class Main{

  public static int f(int n){
    if(n % 2 == 0){
      return n / 2;
    }else{
      return 3 * n + 1;
    }
  }

  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    int s = sc.nextInt();
    int a = s;
    int n = 0;
    while(s != 4){
      s = f(s);
      n++;
    }
    n++;
    if(a == 1 || a == 2){
      System.out.println(4);
    }else
      System.out.println(n + 3);
  }
}

/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