Arya In Grid

Arya the monkey is trapped inside an $N\times M$ grid! The grid has $N$ rows (numbered $1$ to $N$ from top to bottom) and $M$ columns (numbered $1$ to $M$ from left to right). The cell at the intersection of row $i$ and column $j$ is denoted $(i, j)$. Arya wants to escape the grid, of course - but first, he needs information. Arya is initially at cell $(X_0, Y_0)$ of the grid, and can move to