How many diapers?

Kay
Hello ladies, I'm starting to stock up on diapers and I was wondering how much is too much? I don't want to end up with a bunch of unused diapers. It's been a while since my first baby and I don't remember how much they use. I know all babies grow at different rates but anyone have a good estimate? So far I have a a few of size 1, 2, and 3. Thanks in advance!