Need help writing a VB Script for Excel.

I'm using Excel 2004 (version 11.5.1) and have created an Excel sheet
that has
an area to enter a variable or numerical number (Cell, E1). Then I have
12
checkboxes on the left of Excel Sheet, which I created with the Form
Toolbox.
What I would like to do is be able to enter the variable in the E1 Cell,
then check
off one of the checkboxes and have that variable appear in another Cell
(E3, E5,
or E7). If multiple checkboxes are checked, then I would like the
variables to
increase in value by one (e.g. Original Variable in E1 Cell + 1).

Does anyone have any suggestions?

Cheers!

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