@Override
	protected int computeNumberOfLocations() {
		int nbrOfPictures = 0;
		int nbrOfMarkers = this.markers.size();
		for (int index = 0; index < nbrOfMarkers; index++) {
			nbrOfPictures += this.markers.get(index).computeNumberOfLocations();
		}
		return nbrOfPictures;
	}