import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int s = sc.nextInt();
    int m = 1;
    for (int i = 0;i < 10000;i++) {
      if(s == 4 || s == 2 || s == 1) {
        break;
	  }
      if(s % 2 == 0) {
        s = s / 2;
        m = m + 1;
	  }
      else {
        s = (s * 3) + 1;
		m = m + 1;
	  }
	}
    m = m + 3;
	System.out.println(m);
  }
}

/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