Interpretation I dont know what to do?

I don't understand what I am supposed to do in this exercise, I am beginning programming contest, if you can help me is very appreciated, I have seen formulas, but I开发者_运维百科 don't understand what to do, I feel very stupid , and for everyone is easy :(

http://www.codeforces.com/contest/1/problem/A

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The site seems to be in Russian or English. I'm guessing that neither of these is your first language.

The problem is to pave a rectangular area with square tiles. You are given three values:

• length of the rectangular area
• width of the rectangular area
• size of the tiles (length of a side: remember they are square)

You must write a program that takes the three numbers above as inputs (on the command line) and provide the number of tiles required as output.

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One little hint. Suppose that you must cover an axn rectangle with axa stones. Then the solution is "k stones", where ka is the first multiple of a greater than or equal to n. (Draw a picture.)

How to go for k? Do a division and have a look at the documentation of the ceil() function (it is quite standard).

Now what happens if we move to a 2-dimensional problem, i.e. if we have to cover an mxn rectangle? (Draw another picture, do some experiments.)