Room

Given a room of size $n\times m$. Find the maximum number of square tiles of size $k\times k$ that can be placed in the room.

The image shows one of the possible maximum answers for $n=5$, $m=3$, $k=2$.

Input

The first line contains an integer $n$ ($1\le n\le 1000$).

The second line contains an integer $m$ ($1\le m\le 1000$).

The third line contains an integer $k$ ($1\le k\le 1000$).

Output

Output a single integer — the answer to the problem.

Examples