The height of the Qutub Minar is 230 metres. It is planned that a stairway from the ground to the top of the Minar would be made by arranging cube shaped boulders in a step like fashion. A man first places a boulder on the ground. He then steps on to it, and then throws one boulder down such that it touches the side of the previous bolder, and then places one over the new one. He then climbs onto the last boulder thus placed and continues to do the same to create steps right to the top, with each of his step being 1 metre. If each boulder measures 1 cubic metre, how many boulders are required in all?