Please answer a question about the following article about MP3:

Non-standard bit rates up to 640 kbit/s can be achieved with the LAME encoder and the freeformat option, although few MP3 players can play those files. According to the ISO standard, decoders are only required to be able to decode streams up to 320 kbit/s.

What is the highest bit rate the LAME encoder allows?
640 kbit/s