Cuckold Puzzle - Official Breeding - Poem

I received this riddle from her bull at Office..... Please help me solve it....

We are bully team-mates always riding her pussy
We are less than one hundred but as tough as can be
We work in three shifts one after each other
Our numbers double from one shift to another
We fuck our toy all through the day & night
In groups of fives coz her holes are not tight
For today, twelve of us were swallowed by our whore
Leaving behind more than two third of the cocks sore
So we continue the gangbang refusing her pleading
So tell me how many of us are left to finish her breeding