Tudor, having finally had his fill of tea, now needs to think about keeping his goats safe.

Tudor has obtained a large rectangular door that is metres long, metres high, and 1 metre thick. He intends on using this door to gate access to his goats.

There's only one problem - having just one door is aesthetically unpleasing to Tudor.

Therefore, he intends on taking the door and cutting it in half to make a set of double doors that he can use to gate access to his goats.

After cutting the door in half, what is the volume of one of the doors?

#### Constraints

In tests worth 14 marks, .

#### Input Specification

The input will consist of two positive space separated integers, and .

#### Output Specification

Output, on a single line, the volume of one of the doors. The volume must be printed with exactly one digit after the decimal point.

#### Sample Input

`2 2`

#### Sample Output

`2.0`

## Comments

~~Is Batch #2 even solvable?~~Java's String.format some how doesn't work... Figured out how to solve it without using String.format

It's tricky tho