import java.util.*;

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