08. Pet Shop

import java.util.Scanner;

public class ZooStore {
    public static void main(String[] args) {
        Scanner myScan = new Scanner(System.in);
        int dogs = Integer.parseInt(myScan.nextLine());
        int otherAnimals = Integer.parseInt(myScan.nextLine());

        double totalAmount = (dogs * 2.5) + ( otherAnimals * 4);

        System.out.println(totalAmount + "lv.");

    }
}