I aready installed Acrobat SDK. But this way I should use Acrobat. I'd like to use Reader.
So I found the solushion of my problem without using any programms or applications.
At my program interface I use VBS (VBScript). I can open PDF file as text and find inside this text "/COUNT" parameter (key). This key allows me to obtain the count of pages (layouts). The solution is more simple.
Thank you experts anyway. I'm glad to be participant of this forum!