import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int s = sc.nextInt();
    sc.close();
    List<Integer> ls = new ArrayList<>();
    ls.add(s);
    int c = s;
    for (int i = 1; i < 1000000; i++) {
      if (c % 2 == 0) {
        int f1 = c/2;
        if (ls.contains(f1)) {
          System.out.println(ls.size()+1);
          return;
        }
        ls.add(f1);
        c = f1;
      } else {
        int f2 = 3 * c + 1;
        if (ls.contains(f2)) {
          System.out.println(ls.size()+1);
          return;
        }
        ls.add(f2);
        c = f2;
      }
    }
  }
}

/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