import java.util.*;

class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int s = sc.nextInt();
    int count=4;
    while(s!=4&&s!=2&&s!=1){
      count++;
      s=calc(s);
    }
    System.out.println(count);
  }
  static int calc(int n){
    if(n%2==0){
      return n/2;
    }
    return 3*n+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