What is $h^0(O(m)_V)$, where $V\subseteq \mathbb{C}P^n$ is a degree $d$ hypersurface?

Question

I am trying to compute the number of section of the restriction of the line bundle $O(m)$ to a hyper-surface $V$, given by a degree $d$ polynomial. I cannot figure out how to do this and any help would be appreciated.