public class Triangle
{
   private int width; 
   public Triangle (int aWidth)
	{
	   width = aWidth;
	}
	
	public int getArea()
	{
	  if (width <= 0) return 0;
	  if (width == 1) return 1;
	  Triangle smallerTriangle = new Triangle (width -1);
	  int smallerArea = smallerTriangle.getArea();
	  return smallerArea + width;
	}
}