package firstStepsInCoding;

import java.util.Scanner;

public class Repainting {
    public static void main(String[] args) {
        Scanner scanner= new Scanner(System.in);
        int nylon=Integer.parseInt(scanner.nextLine());
        int paint=Integer.parseInt(scanner.nextLine());
        int thinner=Integer.parseInt(scanner.nextLine());
        int hours=Integer.parseInt(scanner.nextLine());
        double priceNylon=1.50;
        double pricePaint=14.50;
        double priceThinner=5.00;
        double bags=0.40;

        double totalNylon=(nylon+2)*priceNylon;
        double totalPaint=(paint*0.1+paint)*pricePaint;
        double totalThinner=thinner*priceThinner;
        double result=totalPaint+totalNylon+totalThinner+bags;
        double costs=result*0.3*hours;
        double finish=costs+result;

        System.out.println(finish);

    }
}