Based on what linca and nicta wrote in the past, at most one.

_{*Lunatic*, n.
One whose delusions are out of fashion.}

but votes in the National Assembly rarely take place with a full chamber. The real work is done in the various Committees, and the plenary sessions usually involve a small number of MPs from each side - unless the TVs are there. Each side only put up enough reps to have "normal" pro rata representation. Very occasionally, the majority party fucks up in organising how many people are around (or are recalled urgently from nearby areas) for a vote, and lose a formal vote from being outnumbered, but that's very rare.

In the long run, we're all dead. John Maynard Keynes