I put 3.
There are 3 instruments I can play to performance level:
Guitar
Bass
Ukulele (I actually play it to a reasonable level, rather than just a couple of chords)
Then there a few where I can (and do) play a little bit:
Keys (simple parts for home recording)
Mouth Organ (couple of Feelgood songs with the covers band)
Banjo (occasional song at the folk circle, bit of home recording)
Fiddle (occasional simple part for home recording)
Drums ( for example simple snare with brushes on home recording)