I started counting on my fingers. I got up to 5 on one hand then up to 8 on the second one before I forgot where I was up to, so went back to my first hand and got up to 13, then switched to my other hand and nearly got there but got confused at 17. This has been going on for the last couple of hours and I'm up to 23,519. So I can see how it's possible for you to have too many trees to count.