Help with expression

[ajay_askoolum]

I have never coded Python, came across a code snippet that I'd like to port to C#. I need to understand this expression,

1	r-C(n-cs,k-s)>0:

More precisely C(). What does this function do?
Thanks for your help.

[buran]

how we could know what it does? show more of your code - it is either defined in the same module or imported from somewhere...