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# Problem ATriangle Area

Per-Magnus managed to solve his addition homework thanks to you, but now he is unfortunately posed with an even greater problem.

He has been given a triangular cake by his mother, and wonders what the area of it is. It turns out Per-Magnus forgot the formula for computing it!

Per-Magnus managed to measure the base and height of the triangle with a ruler. Given this, compute the area of the triangular cake.

## Input

The input consists of a single line with two integers $1 \le h \le 1000$ and $1 \le b \le 1000$, the height and base of the triangle.

## Output

Output a single number, the area of the triangle. Your answer must be correct within an absolute or relative error of $10^{-7}$.

Sample Input 1 Sample Output 1
1 1

0.5

Sample Input 2 Sample Output 2
2 2

2

CPU Time limit 1 second
Memory limit 1024 MB
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