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Problem B
Triangle 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 |
