Mock CCC '20 Contest 1 J3 - A Geometry Problem

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Points: 3 (partial)
Time limit: 1.0s
Memory limit: 1G

Problem type

koosaga is drawing a logo for the next iteration of the KAIST contest. He has gotten lazy, so he has taken a rectangle of length X and height Y and drawn the two diagonals of the rectangle, forming four small triangles. He wishes to know the area of one of these triangles in the figure he has drawn.


1 \le X, Y \le 10^9

In tests worth 14 marks, \max(X, Y) \le 10.

Input Specification

The input will consist of two positive integers, X and Y, X on the first line and Y on the second.

Output Specification

Output, on a single line, the area of one of the given triangles. The area must be printed with exactly two digits after the decimal point.

Sample Input


Sample Output



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