Calculating multiple checkbox values in a .jsp file

In essence here is(are) my issue(s):

In my .jsp file:

1)I set my two base Integer variables (lawful =0, good =0)

2) I have a submission form with 4 columns of checkboxes. We'll call them checkbox a, checkbox b, checkbox c & checkbox d.

The values of each check are as follows:

a = (lawful +1, good+1)
b = (lawful -1, good+1)
c = (lawful +1, good-1)
d = (lawful -1, good-1)

3) I need for calculating purposes, the ability to return the sum of any combination of 5 checkboxes inside the columns.

4) Based on THAT value, I then return a string.

I have the end logic (#4) completed but am lost as to approaching the calculating of each checkbox.

[Sum of checkboxes][https://i.stack.imgur.com/pKbv3.png