# Closest Pair

Limits 1s, 512 MB

You will be given $N$ pair of coordinates on a 2D space. You will determine distance between the closest pair of points.

The distance between any two points is calculated as:

$D = \sqrt{ {(x_2 - x_1)}^2 + {(y_2 - y_1)}^2 }$

## Input

The input will start with $N$ ($1 \le N \le 1000$), the number of coordinates. Then $N$ lines will follow, each with a pair of integers $X_i$ and $Y_i$ ($-1000 \le X_i, Y_i \le 1000$) representing the $x$ and $y$ coordinates of the points.

## Output

Print the distance between the closest pair from among the given points. Absolute or relative error greater than $10^{-4}$ will be ignored.

## Sample

InputOutput
3
1 1
2 7
3 5

2.23606797749979


The two closest points are $(2, 7)$ and $(3, 5)$. The distance between these two points is 2.23606797749979.