I will be first to say that the typical advice on here is to just throw caution to the wind and tell you to just bring what you want, nobody checks, you'll be fine. I would ignore that advice in your case, we are not talking meds that most on here take. I would try to find some resources for traveling with Adderall specifically. There should be some within the ADHD community.
As for general advice, Bring only what you need, if you have a 30 day supply, take only 15 days worth, plus maybe 1 or 2 days. Keep it in the original container with the original label. It might be prudent (though it may mean nothing) to have your Doctor provide a letter indicating what you are prescribed, dosage, and why. It may not help, but it can not hurt, and may help.
Myself? I would cautiously take the meds to Greece...Turkey? That would cause me some concern as well, same with several other countries (Japan, Egypt, just to name a couple.)