Diagonal movement

Given the coordinates $(x, y)$ of a point in 2-D plane. Find if it is possible to reach $(x, y)$ from $(0, 0)$. The only possible moves from any coordinate $(i, j)$ are as follows: - Go to the point with coordinates $(i + 1, j + 1)$. - Go to the point with coordinates $(i + 1, j - 1)$ - Go to the point with coordinates $(i - 1, j + 1)$. - Go to the point with coordinates $(i - 1, j - 1)$. ###