01.Sandbox - 07.01.2018

package TestJan;

import java.util.Scanner;

public class Sandbox {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        double a = Double.parseDouble(scanner.nextLine());
        double b = Double.parseDouble(scanner.nextLine());
        double price = Double.parseDouble(scanner.nextLine());
        double pricePerKg = Double.parseDouble(scanner.nextLine());

        double area = a * b;
        double areaSand = (a - 0.4) * (b - 0.4);
        double borders = area - areaSand;
        double sand = Math.ceil(areaSand * 20);
        double pipes = Math.ceil(borders / 0.44);
        double sum = sand * price + pipes * pricePerKg;

        System.out.printf("%.2f", sum);
    }
}