import java.util.*;
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-1;i++){
            x[i]=sc.nextInt();
        }
        int ans=10000000;
        for(int c=1;c<=100;c++){
            int total=0;
            for(int i=0;i<=n-1;i++){
                total+=(x[i]-c)*(x[i]-c);
            }
            if(total<ans){
                ans=total;
            }
        }
        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