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## 1956. Fire Signals

Time limit: 1.0 second
Memory limit: 64 MB
Captain Vrungel and his mate Lom were shipwrecked and got to an uninhabited island. While the captain sought for fresh water in the island jungle, Lom decided to make some fire signals on the beach. He wanted to burn them all at night to send a distress signal that could be seen from a ship.
When captain Vrungel returned to the beach, Lom had already made n bonfires. Captain looked at the fires and said that if one set all fires in one line they could be seen not only from a ship but from an airplane too. Find the minimal total distance, that Lom’s fire signals should be moved to, to be set in one line.

### Input

First line contains an integer n that is the number of fire signals (2 ≤ n ≤ 1000). Each of the next n lines contains integers xi, yi that are the coordinates of i’th fire signal (−106xi, yi ≤ 106).

### Output

Output the minimal total distance that Lom should move his fire signals to. The answer must be given with absolute or relative error not exceeding 10−6.

### Sample

inputoutput
```4
0 0
0 1
1 1
1 0
```
```1.414214
```
Problem Author: Pavel Klimov (prepared by Olga Soboleva)
Problem Source: Ural FU contest. Kontur Cup. Petrozavodsk training camp. Winter 2013