import java.util.*;
 
public class Main{
  public static void main(String...args){
    Scanner s = new Scanner(System.in);
    int n = s.nextInt(); int[] x = new int[n];
    int max = 0, min = 0;
    for(int i = 0;i < n;i++){
      x[i] = s.nextInt();
      if(i == 0 || x[i] < min){ min = x[i]; }
      if(i == 0 || x[i] > max){ max = x[i]; }
    }
    int minv = 0;
    for(int i = min;i < max;i++){
      int tmp = 0;
      for(int j = 0;j < n;j++){
        tmp+=(x[j]-i)*(x[j]-i);
      }
      if(i == min || tmp < minv){minv = tmp;}
    }
    System.out.println(minv);
  }
}
/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