Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
Never use someone else's code, read the tutorials or communicate with other person during a virtual contest.

No tag edit access

The problem statement has recently been changed. View the changes.

×
A. Theatre Square

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputTheatre Square in the capital city of Berland has a rectangular shape with the size *n* × *m* meters. On the occasion of the city's anniversary, a decision was taken to pave the Square with square granite flagstones. Each flagstone is of the size *a* × *a*.

What is the least number of flagstones needed to pave the Square? It's allowed to cover the surface larger than the Theatre Square, but the Square has to be covered. It's not allowed to break the flagstones. The sides of flagstones should be parallel to the sides of the Square.

Input

The input contains three positive integer numbers in the first line: *n*, *m* and *a* (1 ≤ *n*, *m*, *a* ≤ 10^{9}).

Output

Write the needed number of flagstones.

Examples

Input

6 6 4

Output

4

Codeforces (c) Copyright 2010-2021 Mike Mirzayanov

The only programming contests Web 2.0 platform

Server time: Feb/25/2021 20:14:59 (f1).

Desktop version, switch to mobile version.

Supported by

User lists

Name |
---|