import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int X[] = new int[N+1];
    
    int total = 0;
    for (int i = 1 ; i <= N ; i++) {
      X[i] = sc.nextInt();
      total += X[i];
    }
    
    int ave = total / N;
    int ave1 = ave + 1;

    int p = 0;
    int p1 = 0;
    for (int i = 1 ; i <= N ; i++) {
      p += (X[i] - ave) * (X[i] - ave);
      p1 += (X[i] - ave1) * (X[i] - ave1);
    }
    System.out.println(Math.min(p, p1));
  }
}
/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