package com.company;

import java.util.Scanner;

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

        String halfBottles = scanner.nextLine();
        String fullBottles = scanner.nextLine();

        double small = Double.parseDouble(halfBottles);
        double big = Double.parseDouble(fullBottles);


        double resultSmall = small * 0,1;
        double resultBig = big * 0,25;

        double result = resultBig + resultSmall;

        System.out.println(result);
    }
}