Center of Masses

Input

The input consists of multiple test cases. Each test case begins with the integer $n$ (n \le 100), the number of vertices of the polygon. This is followed by $n$ pairs of integers, each pair representing the $x$ and $y$ coordinates of a vertex (in any order). The last polygon has n < 3 vertices and should not be processed.

Output

For each polygon, output a single line containing the coordinates $x$ and $y$ of its center of mass, each rounded to three decimal places.

Examples