The quadrilateral OABC is a parallelogram, and $\displaystyle \vec{OC} = 3\vec{CD}$

Now, let $\displaystyle \vec{AE} = m \times \vec{OA}$ and $\displaystyle \vec{BE} = n \times \vec{DB}$, where $\displaystyle m, n \in R^+$. Find the value of $\displaystyle m$ and $\displaystyle n$.

I can't seem to find how to calculate $\displaystyle m$ and $\displaystyle n$, anyone know how to?