Score : 100 points
It has been decided that a programming contest sponsored by company A will be held, so we will post the notice on a bulletin board.
The bulletin board is in the form of a grid with N rows and N columns, and the notice will occupy a rectangular region with H rows and W columns.
How many ways are there to choose where to put the notice so that it completely covers exactly HW squares?
Input is given from Standard Input in the following format:
N H W
Print the answer.
3 2 3
2
There are two ways to put the notice, as follows:
### ... ### ### ... ###
Here, #
represents a square covered by the notice, and .
represents a square not covered.
100 1 1
10000
5 4 2
8