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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Linq;

namespace C___Rally
{
    class Program
    {
        static void Main (string[] args)
        {
            var n = int.Parse (Console.ReadLine ());
            var x = new int[n];
            var input = Console.ReadLine ().Split (' ');
            for (var i = 0; i < n; i++)
            {
                x[i] = int.Parse (input[i]);
            }
            var min = double.MaxValue;
            for (var i = x.Min(); i <= x.Max(); i++)
            {
                var a = 0.0;
                for (var j = 0; j < n; j++)
                {
                    a += Math.Pow (x[j] - i , 2);
                }
                min = Math.Min (min, a);
            }
            Console.WriteLine (min);
        }
    }
}