Wytherins in Paradise

You are a resident of Paradise, and you are now 18 years old so you need to start working for the community. So you were assigned to look after a special animal called “wytherins” which are only found in Paradise. They live on a rectangular piece of island which is made up of blocks (every block is of equal dimensions). The dimension of the island is $m \times n$, where $m$ is the length of the is