According to Beersmith 2.0 a 3 step starter with 1 pack will give you @4200 billion cells
step 1: 1 pack (96 billion) in 1l =397 Billion
step 2: 397 Billion in 4l=1588 Billion
step 3:1588 Billion in 4l=4290 Billion
Shoot some pure O2 in the starter every 4 hours and you will probably get more.
Tom?