Crystal Reports Help with Crystal Formula

Message

     Hello Everyone,

In my crystal report XI R2 which  is calling a sql server stored procedure and it has 2 datetime parameters called @StartDate  and  @EndDate.   

And I want in the page header section of the report as follows:

For June 14th thru June 20th (Mon thru Sun) - I would like to display "Release Number 100" in the page header of crystal report

For June 21st thru June 27th (Mon thru Sun) - I would like to display "Release Number 101" in the page header of crystal report

For June 28th thru July 04th (Mon thru Sun) - I would like to display "Release Number 102" in the page header of crystal report

For July 05th thru July 11th (Mon thru Sun) - I would like to display "Release Number 103" in the page header of crystal report

and so on (the release number should keep incrementing)

Please help me in accomplishing this. 

Any help will be greatly appreciated

Thanks in advance