#### Recipe 1

Ahmed, the mighty leader of the anti-gang gang AC, is also the owner of a major franchise that sells clothing! As the 2^{nd} in command of Calvin's gang CA (rival gang of AC), you come up with a sneaky idea to put them out of business: buying out their entire T-shirt stock and monopolizing the T-shirt industry! All that's left is to calculate how much money you need to ask your Boss for in order to execute your scheme. AC T-shirts come in 3 sizes — small, medium and large. You can purchase small T-shirts for dollars, medium T-shirts for dollars, and large T-shirts for dollars. Of course, small shirts cost strictly less than medium shirts which cost strictly less than large shirts. In addition, AC also has a special buy — 3-T-shirts get one free deal. That is, for every 3 shirts you buy full priced, you can pick a T-shirt of any size and purchase it at $0. With this information in mind, you would like to figure out the minimum amount of money you need to buy out AC's T-shirts.

#### Input Specification

Line 1: Three integers space separated: — number of small, medium and large T-shirts AC has in stock.

Line two: Prices, space separated with each price in the format: (dollars and cents, joined by a period). Each price is guaranteed to be between and , and together satisfy .

#### Output Specification

A single real number on one line, the amount of money asked in the problem statement, rounded to two decimal places in the format (dollars and cents, joined by a period).

**Note:** neither input nor output should have leading zeroes, 5 dollars should be expressed as 5.00, **not** 05.00.

#### Constraints

#### Sample Input

```
3 2 1
1.00 2.00 3.00
```

#### Sample output

`7.00`

## Comments

Sorry to those people trying to solve this problem with exact precision, numbers did not necessarily have 2 points after the decimal.

This has been fixed and all submissions rejudged.