[crashmat]

I think amount of is usually used for 'continuous' (I'm not sure on the word) substances like flour, water, or salt, rather than multiples of discreet objects.

[quartesixte]

I can also have:

Just the right amount of cats Just the right amount of internet points Just the right amount of chutzpah

[chucksmash]

Implying chutzpah is a discrete variable, and chutzpah is never discreet