import java.util.Scanner;

/**
   This program simulates an elevator panel that skips the 13th floor, checking for 
   input errors.
*/
public class ElevatorSimulation2
{
   public static void main(String[] args)
   {  
      Scanner in = new Scanner(System.in);
      System.out.print("Floor: ");
      if (in.hasNextInt())
      {
         // Now we know that the user entered an integer

         int floor = in.nextInt();

         if (floor == 13)
         {
            System.out.println("Error: There is no thirteenth floor.");
         }
         else if (floor <= 0 || floor > 20)
         {
            System.out.println("Error: The floor must be between 1 and 20.");
         }
         else
         {
            // Now we know that the input is valid

            int actualFloor = floor;
            if (floor > 13)
            {  
               actualFloor = floor - 1;
            }

            System.out.println("The elevator will travel to the actual floor "
               + actualFloor);
         }
      }
      else
      {
         System.out.println("Error: Not an integer.");
      }
   }
}