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];
		for(int i = 0; i < N; i++) {
			X[i] = sc.nextInt();
		}
		int result = 1000000;
		for(int i = 1; i < 101; i++) {
			int sum = 0;
			for(int j = 0; j < N; j++) {
				sum += (X[j] - i) * (X[j] - i);
			}
			result = Math.min(result, sum);
		}
		System.out.println(result);
	}
}
/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