I want to know the answer to the following question:
How many customers did ACS have when Roberts and his partners purchased it?
All the background I'm provided with is that "In 1963, Ralph J. Roberts in conjunction with his two business partners, Daniel Aaron and Julian A. Brodsky, purchased American Cable Systems as a corporate spin-off from its parent, Jerrold Electronics, for US $500,000.". Is that enough to answer the question?