How to close a software after a certain time?

In order to be specific, I need my system to be inaccessible, after reaching the time determined by me, but this time can not be through the date, I need every time the software is started the system counts 1, and when it arrives for example at 30 (which would be the number of times it was initialized) the system shuts down. In this system I can not get data from the internet, nor use a database.