import java.util.Scanner;
import java.lang.Math;

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 ave = 0;
		for(int data: x){
			ave += data;
		}
		ave = (int)Math.rint((double)ave / n);
		int sum = 0;
		for(int data: x){
			sum += Math.pow((data - ave), 2);
		}
		System.out.println(sum);

	}
} import java.util.Scanner; Scanner java.util import java.lang.Math; Math java.lang 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 ave = 0;
		for(int data: x){
			ave += data;
		}
		ave = (int)Math.rint((double)ave / n);
		int sum = 0;
		for(int data: x){
			sum += Math.pow((data - ave), 2);
		}
		System.out.println(sum);

	}
} 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 ave = 0;
		for(int data: x){
			ave += data;
		}
		ave = (int)Math.rint((double)ave / n);
		int sum = 0;
		for(int data: x){
			sum += Math.pow((data - ave), 2);
		}
		System.out.println(sum);

	} main {
		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 ave = 0;
		for(int data: x){
			ave += data;
		}
		ave = (int)Math.rint((double)ave / n);
		int sum = 0;
		for(int data: x){
			sum += Math.pow((data - ave), 2);
		}
		System.out.println(sum);

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int[] x = new int[n]; x new int[n] n for(int i = 0; i < n; i++){
			x[i] = sc.nextInt();
		} int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
			x[i] = sc.nextInt();
		} {
			x[i] = sc.nextInt();
		} x[i] = sc.nextInt() x[i] x i sc.nextInt() sc.nextInt sc int ave = 0; ave 0 for(int data: x){
			ave += data;
		} int data x {
			ave += data;
		} {
			ave += data;
		} ave += data ave data ave = (int)Math.rint((double)ave / n) ave (int)Math.rint((double)ave / n) Math.rint Math (double)ave / n (double)ave n int sum = 0; sum 0 for(int data: x){
			sum += Math.pow((data - ave), 2);
		} int data x {
			sum += Math.pow((data - ave), 2);
		} {
			sum += Math.pow((data - ave), 2);
		} sum += Math.pow((data - ave), 2) sum Math.pow((data - ave), 2) Math.pow Math (data - ave) data ave 2 System.out.println(sum) System.out.println System.out System System.out sum String args[] args 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 ave = 0;
		for(int data: x){
			ave += data;
		}
		ave = (int)Math.rint((double)ave / n);
		int sum = 0;
		for(int data: x){
			sum += Math.pow((data - ave), 2);
		}
		System.out.println(sum);

	}
} 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 ave = 0;
		for(int data: x){
			ave += data;
		}
		ave = (int)Math.rint((double)ave / n);
		int sum = 0;
		for(int data: x){
			sum += Math.pow((data - ave), 2);
		}
		System.out.println(sum);

	}
} Main
import java.util.Scanner;
import java.lang.Math;

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 ave = 0;
		for(int data: x){
			ave += data;
		}
		ave = (int)Math.rint((double)ave / n);
		int sum = 0;
		for(int data: x){
			sum += Math.pow((data - ave), 2);
		}
		System.out.println(sum);

	}
}
