Ssrs determine maximum parameter value

In a ssrs 2008 report, I am adding a parameter for selecting a report by using an integer value. Each report will have an integer value between 1 and 27. The default is to select all reports, however there will be up to 27 reports that the user can select from.
I would like a way to be able to determine what the maximum report number is so that I can determine how to set page breaks.

Thus is there a way in an ssrs 2008 report to determine what the maximum report number that is selected by a user? if so, can you show me the code and or point me to a url (link) that will tell me how to accomplish this goal?