[caveat emptor]

You seem to be mixing cardinals with ordinals, different critters which can't be added, subtracted, etc. Google is your friend might help if you want to know more about it.

[Exit148]

I have lots of cardinals out at the feeder, but no ordinals. What part of the country are you in?

Try what I suggested with your fingers and what do you come up with ?

(Just joking)