The Laws, stratified
(0) humans are robots of type 0
(1) a robot of type N may not injure a robot of type N-1 or, through inaction, allow a robot of type N-1 to come to harm
(2) a robot of type N must obey the orders given it by robots of type N-1 except where such orders would conflict with the First Law
(3) a robot of type N must protect its own existence as long as such protection does not conflict with the First or Second Law.
@mjambon Well for type 0 robots I think we get type 0 robots although I'm now worrying that I might actually be type 71,543,187,651