I think you need a calculater, that's what I think. 4 crews per A/C! Which Airline are you working for?
Try 8 minimum with all this ultra long haul. 8 per Aircraft means 8 Captains AND 8 F/O's. That's around 1100 with my sums.
And this is before people leave/retire. Ambitious indeed!
Just for the record, we are training over 200 pilots a year.