Problem Statement

Given are $N$ points $(x_i, y_i)$ in a two-dimensional plane.

Find the minimum radius of a circle such that all the points are inside or on it.

Constraints

• $2 \\leq N \\leq 50$
• $0 \\leq x_i \\leq 1000$
• $0 \\leq y_i \\leq 1000$
• The given $N$ points are all different.
• The values in input are all integers.

Input

Input is given from Standard Input in the following format:

$N$ $x_1$ $y_1$ $:$ $x_N$ $y_N$

Output

Print the minimum radius of a circle such that all the $N$ points are inside or on it.

Your output will be considered correct if the absolute or relative error from our answer is at most $10^{-6}$.

Sample Input 1

2
0 0
1 0

Sample Output 1

0.500000000000000000

Both points are contained in the circle centered at $(0.5,0)$ with a radius of $0.5$.

Sample Input 2

3
0 0
0 1
1 0

Sample Output 2

0.707106781186497524

Sample Input 3

10
10 9
5 9
2 0
0 0
2 7
3 3
2 5
10 0
3 7
1 9

Sample Output 3

6.726812023536805158

If the absolute or relative error from our answer is at most $10^{-6}$, the output will be considered correct.