import java.util.Scanner;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int n = Integer.parseInt(sc.next());
    double[] array = new double[n];
    double ave = 0;
    int sum = 0;
    for(int i = 0; i < n; i++){
      array[i] = sc.nextDouble();
      ave += array[i];
    }
    ave = (ave/array.length);
    if((ave*10)%10 >= 5){
      ave++;
    }
    int avera = (int) ave;
    for(int i = 0; i < array.length; i++){
      sum += Math.pow(Math.abs(array[i]-avera),2);
    }
    System.out.println(sum);
  }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz