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1207. Median on the Plane

Time limit: 0.5 second
Memory limit: 64 MB
The are N points on the plane (N is even). No three points lie on the same straight line. Your task is to select two points in such a way, that straight line they belong to divides the set of points into two equal-sized parts.

Input

First line contains one integer N (4 ≤ N ≤ 10000). Each of next N lines contains pair of integers xi, yi (−106xi, yi ≤ 106), the coordinates of i-th point.

Output

Print the numbers of selected points.

Sample

inputoutput
4
0 0
1 0
0 1
1 1
1 4
Problem Author: Pavel Atnashev
Problem Source: USU Internal Contest, March 2002