import java.util.Scanner;

public class Task1 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int kozunak = Integer.parseInt(scanner.nextLine());
        int eggsKora = Integer.parseInt(scanner.nextLine());
        int cookiesKg = Integer.parseInt(scanner.nextLine());

        double kozunakPrice = kozunak * 3.20;
        double eggsPrice = eggsKora * 4.35;
        double cookiesPrice = cookiesKg * 5.40;
        double eggsPaint = eggsKora * 12 * 0.15;

        double sum = kozunakPrice + eggsPrice + cookiesPrice +eggsPaint;

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








    }
}