Kodlak, Vilkas, Farkas, and Player, but not a fifth because as I understand it Aela doesn't want to be cured. So you get one to keep as a trophy...although none of mine ever get removed from inventory as I cure them.

I found the only way to get them out of my inventory is to only pick them up one at a time, do the quest for it, then go back to Glenmoril for every werewolf after that. I think Isch may be stuck with them if they can't removeitem with the console. Ew...
somewhere south of Ivarstead, there's a site with dead chickens, i forgot the details, if you triggered something there, the dead chickens will be resurreted
I'd like to see this little vignette properly, so hope it resets at some point.