# Cauchy's integral formula for different closed curve.

I know that there is a formula called Cauchy's integral formula for entire function $$f$$

$$f(a)=\frac{1}{2\pi i}\int_{C}\frac{f(s)}{s-a}ds$$

Where $$C$$ is a closure of a disc.

Is it possible that we consider different type of closed curve for example rectangle, and by special integral on this curve that we would calculate value of $$f$$ at any point inside this curve?