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?
In tests worth 14 marks, .
The input will consist of two positive space separated integers, and .
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.