Simple Operation and Calculation Dance Hall

import java.util.Scanner;
public class wa {
        public static void main(String[] args) {
            Scanner scanner = new Scanner(System.in);

            double lenght = Double.parseDouble(scanner.nextLine());
            double width = Double.parseDouble(scanner.nextLine());
            double wardrobeSide = Double.parseDouble(scanner.nextLine());

            double hallArea = (lenght * 100) * (width * 100);
            double areaWardrobeSide = (wardrobeSide * 100) * (wardrobeSide * 100);
            double benchArea = (hallArea / 10);
            double freeSpace = hallArea - areaWardrobeSide - benchArea;
            double dancers = freeSpace / (40 + 7000);



            System.out.printf("%.0f", Math.floor(dancers));
        }
    }