How many parameters are needed to describe this distribution?

Consider a distribution consisting of three binary variables which admit the factorisation: \( p(a, b, c) = p(a \mid b)p(b \mid c)p(c) \)

How many parameters are needed to specify distributions of this form?

Note that this is different to the general case where all variables might be dependent: \( p(a, b, c) = p(a \mid b, c)p(b \mid c)p(c) \)