import java.util.*;

public class Main{
	public static void main(String arg[]){
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		int a[] = new int[n];
		int sum=0;
		for(int i=0;i<n;i++){
			a[i]=sc.nextInt();
			sum+=a[i];
		}
		double d=(double)sum/n;
		int p=(int)Math.round(d);
		int sum1=0;
		for(int i=0;i<n;i++)
			sum1=sum1+((a[i]-p)*(a[i]-p));
		System.out.println(sum1);
	}
}
/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