Exhibit 1

Agreement of Joint Filing

     Pursuant to 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, the undersigned persons hereby agree to file with the Securities and Exchange Commission the Statement on Schedule 13G/A (the “Statement”) to which this Agreement is attached as an exhibit, and agree that such Statement, as so filed, is filed on behalf of each of them.

     IN WITNESS WHEREOF, the undersigned have executed this Agreement.

Dated: February 8, 2008

Camden Partners Limited Partnership By: Camden Partners Capital Management, LLC,            its general partner
/s/ Donald W. Hughes
Name:	Donald W. Hughes
Title:	Member
Camden Partners II Limited Partnership By: Camden Partners Capital Management, LLC,            its general partner
/s/ Donald W. Hughes
Name:	Donald W. Hughes
Title:	Member
Camden Partners Capital Management, LLC
/s/ Donald W. Hughes
Name:	Donald W. Hughes
Title:	Member

David L. Warnock
 

/s/ Donald W. Hughes, Attorney-in-Fact  

Richard M. Johnston
 

/s/ Donald W. Hughes, Attorney-in-Fact  

Richard M. Berkeley
 

/s/ Donald W. Hughes, Attorney-in-Fact  

Donald W. Hughes
 

/s/ Donald W. Hughes  

Shane H. Kim
 

/s/ Donald W. Hughes, Attorney-in-Fact  

F. Mackey Hughes
 

/s/ Donald W. Hughes, Attorney-in-Fact