Hotel Occupancy

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

       Scanner keyboard = new Scanner(System.in);

       int rooms;
       int sumRooms = 0;
       int roomsTaken;
       int sumTaken = 0;

       int floors;

        System.out.println("How many floors are in the hotel?");
        floors = keyboard.nextInt();

       if (floors < 1)
           System.out.println("Wrong data");

       else
       {
           for (int i = 0; i < floors; i++)
           {
               System.out.println("How many rooms are on floor #" + (i + 1)  + " ?");
               rooms = keyboard.nextInt();
               if (rooms < 10)
               {
                   System.out.println("Wrong data");
                   System.exit(0);
               }
               else
               {
                   sumRooms += rooms;
                   System.out.println("How many are taken?");
                   roomsTaken = keyboard.nextInt();
                   sumTaken += roomsTaken;
               }

           }
       }
        System.out.println("Number of all rooms in the hotel");
        System.out.println(sumRooms);
        System.out.println("Number of rooms taken");
        System.out.println(sumTaken);
        System.out.println("Empty rooms");
        System.out.println(sumRooms - sumTaken);
        System.out.println("Occupancy rate");
        Double dTaken = new Double(sumTaken);
        Double dRooms = new Double(sumRooms);
        double occupancyRate = dTaken / dRooms;
        System.out.println(occupancyRate);
    }
}