Let $r,$ $s,$ and $t$ be the roots of the equation $4x^3 - 59x^2 + 32x - 32 = 0.$ Find the value of $f(r) + f(s) + f(t)$, where $f(x) = 4x^3 - 59x^2$.

Let's think step by step and output the final answer within \boxed{}.
user