A delivery drone needs to fly from a starting point to a drop-off location. The drop-off is 4 units east and 3 units north of the starting point. The drone can only fly east or north. There is a restricted airspace at the coordinates 2 units east and 2 units north from the starting point, which the drone must not enter. How many distinct flight paths can the drone take to the drop-off location, using exactly 7 units of travel, and avoiding the restricted airspace?