Even 50 CPUs aren't worth mining for.

Your power usage will cost way more than the coins you earn, also being next to nothing.

Let's say you have the one of the fastest CPUs for mining, being the A10-5800K. Each one of these mines at approximately 100 MH/s. With fifty, you get 5000 MH/s or 5 GH/s.

Let's put that in a calculator assuming your electricity bill is $0.10/kwh.

Yep, in a year you earn $2, and this excludes the power bill + pool fees + difficulty increases.

I would recommend for you to either not mine at all, or use GPUs/ASICs instead.

You could also not mine Bitcoin and mine something else, but the chances of profiting are almost completely nonexistent.