Adding values from checkedboxes on groupbox VB 2010

[Erivan]

I'm new at this I'm using visual basic 2010
how can I add values of checkboxes in a groupbox? I assigned a value to every item on the group box example:

1 Dim hbo As Integer = 16.0
2 Dim starz As Integer = 13.0
3 Dim showtime As Integer = 13.0
4 Dim cinemax As Integer = 13.0
5 Dim any2 As Decimal = 24.0
6 Dim any3 As Decimal = 33.0
7 Dim all4 As Decimal = 42.0

if I check 3, 5, 7 how do I make it sum 3,5,7 to give me a total.
How can I assign that total to the groupbox and then add all the groupboxes