Rick, Morty and the Grid

There is an m x n grid. Rick is standing on the upper left corner of the grid, while Morty is standing on the bottom right corner of the grid. Rick wants to reach Morty, however he can only move one step down or one step right at a time. There are two types of squares in the grid, black and white. Rick cannot cross black squares. The squares on which Rick and Morty are standing are white. Can you