formula is too long

Hello

Can any one please help me in this,how can in compress the following formula

=IF(B3="Monthly",IF(B25="Windows 2003 Std",15,IF(B25="Windows 2003 Ent",30,IF(B25="Windows 2008 Data Center ",40,IF(B25="RHEL 5","30",IF(B25="Windows 2008 Web","15",0))))))+(IF(B3="Quarterly",IF(B25="Windows 2003 Std",40,IF(B25="Windows 2003 Ent",75,IF(B25="RHEL 5","89",IF(B25="Windows 2008 Data Center ",120,IF(B25="Windows 2008 Web","45",0))))))+(IF(B3="Semi-Annually",IF(B25="Windows 2003 Std",75,IF(B25="Windows 2003 Ent",140,IF(B25="Windows 2008 Data Center ",200,IF(B25="RHEL 5","149",IF(B25="Windows 2008 Web","90",0)))))))+(IF(B3="Annually",IF(B25="Windows 2003 Std",150,IF(B25="Windows 2003 Ent",300,IF(B25="RHEL 5","299",IF(B25="Windows 2008 Data Center ",400,IF(B25="Windows 2008 Web","180",0))))))))

Thanks
Rahul