Problem:
Score : 300 points

Problem Statement

There are N people living on a number line.

The i-th person lives at coordinate X_i.

You are going to hold a meeting that all N people have to attend.

The meeting can be held at any integer coordinate. If you choose to hold the meeting at coordinate P, the i-th person will spend (X_i - P)^2 points of stamina to attend the meeting.

Find the minimum total points of stamina the N people have to spend.

Constraints

All values in input are integers.

1 \leq N \leq 100

1 \leq X_i \leq 100

Input

Input is given from Standard Input in the following format:

N
X_1 X_2 ... X_N

Output

Print the minimum total stamina the N people have to spend.

Sample Input 1

2
1 4

Sample Output 1

5

Assume the meeting is held at coordinate 2. In this case, the first person will spend (1 - 2)^2 points of stamina, and the second person will spend (4 - 2)^2 = 4 points of stamina, for a total of 5 points of stamina. This is the minimum total stamina that the 2 people have to spend.

Note that you can hold the meeting only at an integer coordinate.

Sample Input 2

7
14 14 2 13 56 2 37

Sample Output 2

2354

Solution in PHP (5.6.30) (judge verdict: Accepted)

<?php
fscanf(STDIN, "%d", $N);
$X = explode(" ", fgets(STDIN));
//var_dump($X);

$X = array_map('intval', $X);

$mean_ceil = ceil(array_sum($X) / count($X));
$mean_floor = floor(array_sum($X) / count($X));

$ans_1 = 0;
$ans_2 = 0;

for ($i = 0; $i < count($X); $i++){
    $ans_1 += pow($X[$i] - $mean_ceil, 2);
    $ans_2 += pow($X[$i] - $mean_floor, 2);
}

echo min($ans_1, $ans_2);