B'You are given a multiset of points on the plane with integer coordinates. Find the maximum distance between two points from this multiset. The first line of input contains the number of points n (2 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89n xe2 x80 x89 xe2 x89 xa4 xe2 x80 x8950). Next, n pairs of lines follow, each describing a single point: the first line contains x-coordinate, the second one -- the y-coordinate ( xe2 x80 x89- xe2 x80 x8950 xe2 x80 x89 xe2 x89 xa4 xe2 x80 x89x, xe2 x80 x89y xe2 x80 x89 xe2 x89 xa4 xe2 x80 x8950). Some of the points can have identical coordinates. Output the maximum distance between two points from this multiset. The answer is considered to be correct if its absolute or relative error does not exceed 10 xe2 x80 x89- xe2 x80 x894. In the first case the maximum distance is between points (0, xe2 x80 x891) and (4, xe2 x80 x895). In the second case two of the points are the same, so the maximum distance is between one of them and the third point.'...