Black cells in a chessboard solution codechef

Given $n$ ( $n$ is even), determine the number of black cells in an $n \times n$ chessboard.

The only line of the input contains a single integer $n$ .

Output the number of black cells in an $n \times n$ chessboard.

There are $32$ black cells and $32$ white cells in an $8 \times 8$ chessboard. So the answer is $32$ .

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