A 300-newton weight rests on a smooth (friction negligible) inclined plane that makes an angle of 30

Question:

A 300-newton weight rests on a smooth (friction negligible) inclined plane that makes an angle of 30° with the horizontal. What force parallel to the plane will just keep the weight from sliding down the plane? Consider the downward force of 300 newtons to be the sum of two forces, one parallel to the plane and one perpendicular to it.