Not really 0, since any exe file will have some minimum length, and that's defined to be part of the calculation. Conceptually you could cram it into some doze

Not really 0, since any exe file will have some minimum length, and that's defined to be part of the calculation. Conceptually you could cram it into some dozens of bytes (trivial initial state of the universe + basic physics + iteration). In practice, of course, that's ridiculous.