Bottle deposit

/*Bottle Deposit

When you buy something to drink you make a deposit for the bottle. Each bottle has a different deposit. Half liter bottles have $0.1 deposit and the one liter bottles have $0.25 deposit. Calculate the sum which you will make when returning the bottles. You must print two digits after the decimal point.
Input

    On the first line you will receive the number of 0.5L bottles.
    On the second line you will receive the number of 1L bottles.

Output

    You should print the total sum you will earn.

Input

10

10

Output

3.50
*/