If it's from a Contax camera, than it's not a ZE, ZK, ZF or ZS, but Steinback is right that it can possibly be adapted using the Leitax conversion kit.
Of course, it's not an adapter, really, it's surgery.
First thing to check is if the smallest aperture (highest number) on the aperture ring is written in
green, and not white. That means it's an MM (as opposed to AE) version of the lens and can be converted.
Then have a look at the instructions on the page Steinback pointed you to and see for yourself if it's something you'd be interested in undertaking!
Good luck!