import java.util.Scanner;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
	int n =  sc.nextInt();
	int[] x = new int[n];
	int sum = 0;
	int ans = Integer.MAX_VALUE;

	for(int i=0;i<n;i++) {
		x[i] = sc.nextInt();
	}

	for(int i=1;i<=100;i++) {
		for(int j=0;j<n;j++) {
			sum += (x[j]-i)*(x[j]-i);
		}
	ans = Math.min(sum, ans);
	sum = 0;
	}
	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