import java.util.*;

public class Main {

  static Scanner sc = new Scanner(System.in);

  public static void main(String[] args) {

    int s = sc.nextInt();

    int a = s;
    for (int i=0; i<=1000000; i++) {
      if (a == 4 || a == 2 || a == 1) {
        System.out.println(i + 4);
        return;
      }
      if (a % 2 == 0) {
        a = a / 2;
      } else {
        a = 3 * a + 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