Room

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

The figure 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

Print the maximum number of whole tiles of size $k\times k$ that can be placed in the room.

Examples