Reactivation on 3 PC license

Hi, my Norton Internet Security license has just expired and I was thinking to renew it ASAP since it's no longer working after expired (I was expecting at least some basic functionality still run even after expired though :p)

 

But since now I just got my 2nd computer, I was thinking on purchasing the 3 PC license

 

Question is, if I activated Norton in, say computer A and B so it would use 2 of 3. and later on, I reformat my computer A and reinstall/reactivate Norton, same hardware only now clean OS, will it take the 3rd license slot? or can it detect whether I've been activate in this computer A before (from the hardware configuration). because I don't want to waste my 3rd PC license only for that cause and prevent me to install to another computer C

 

Thanks and will look forward for your reply