SharePoint calculations based on check boxes.

SharePoint column, type=calculation, formula to assign values based on a column with check boxes.
While in the formula box, I do not see the column name to be inserted.  Is that because the column has checkboxes?  So I can add the column name manually, but how do I add the column name & checkbox name.
All I am trying to do is get a sum based on how many checkboxes are checked.  one of the check boxes is worth 9 points, the others are worth 3 points.  The column name is Risk.  I was trying to have it max out at 9 points.  so the first if was going to sum just the first checkbox if true, or sum the other 3 for a total of 0-9.

=if(checkbox1=true,9,sum(if(checkbox2=true,3,0),if(checkbox3=true,3,0),if(checkbox4=true,3,0)))
or 
=if([checkbox1],9,if([checkbox2,3,if(checkbox3,3,0)),0)
or
=sumif([checkbox1],9,sumif([checkbox2],3,....

Using info-path with a SharePoint list.  It does not allow you to set a name to each checkbox.  Looks like it defaults to "value"?
So i tried using the title of the check box, and tried using checkbox1 ....

Thanks in advance,
Jim