He is given n(n=1000) points on the plane, each described by (x,y). need to place a rectangle of area S on the plane. Sides of a rectangle should be paralel to X and Y axis. required to find maximal number of points that can be contained by a single rectangle.

I need to find maximum O(N^2 * K) solution to solve problem, where K is answer (maximum amount of points among all rectangle with area S),

thanks in advance,