>>10
The basic amount is, yeah, 3, but you can combine them with certain "normal" sounds, thus raising it to 18. Khoisan languages normally have 40-50, and the basic amount of clicks is usually 5-6. There's also a sick language called Taa (ǃXóõ in native spelling) which has 83 clicks.
The point is, Xhosa and Zulu clicks still are a loan and don't normally occur in word roots, unlike Khoisan clicks that are a normal part of speech and frequently form word roots.