How do you find the derivative of p(x)=f(g(h(k(x))))?

$p ' \left(x\right) = f ' \left(g \left(h \left(k \left(x\right)\right)\right)\right) \cdot g ' \left(h \left(k \left(x\right)\right)\right) \cdot h ' \left(k \left(x\right)\right) \cdot k ' \left(x\right)$.