Ok. FireIce is a bit different, she has this kind of
calculation:

Well, it definately involved integration and summation, human body
is complex though. With a bit of dampling ratio in respect to time,
we get a finalised like this:
I=9, F=6 therefore 9-6=3=C
C+ cup 
Ok ok, don't ban me, here is the real calculation:
9*6= 54(over the aphabetical range, 26)
26*N=78(where N is an integer and bigger than 54/26, therefore
3)
78-54=24=X
OMG!! FI got a X cup! bigger than bbb, so how much more G-string
you had busted? 
Disclaimer, just joking! 