OK, thanks. So let's say I start with the original stadium with 200 seats, than I do two upgrades to 600 seats, than I upgrade the stadium to the next level (amateur stadium, which has 1000 seats). I guess I should still end up with only 1000 seats (and not 1600), however the stadium upgrade should cost less and take less time because I have previously already added some of those 1000 seats, right?