import java.util.Scanner;

class Main {

  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    int s = scanner.nextInt();
    if (s == 1 || s == 2) {
      System.out.println(4);
      return;
    }
    int cnt = 0;
    while (s != 1) {
      if (s % 2 == 0) {
        s /= 2;
      } else {
        s = s * 3 + 1;
      }
      cnt++;
    }
    System.out.println(cnt + 2);

  }

}

/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