import java.util.Scanner;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int[] X = new int[N];
    int min = Integer.MAX_VALUE;
    int max = Integer.MIN_VALUE;
    for (int i = 0; i < N; i++) {
      X[i] = sc.nextInt();
      min = Math.min(min, X[i]);
      max = Math.max(max, X[i]);
    }
    int ans = Integer.MAX_VALUE;
    for (int p = min; p <= max; p++) {
      int sum = 0;
      for (int x : X) {
        sum += (x - p) * (x - p);
      }
      ans = Math.min(ans, sum);
    }
    System.out.println(ans);
  }
}

/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