import java.util.*;
 
public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    List<Integer> list = new ArrayList<>();
    int n = sc.nextInt();
    while(sc.hasNext()){
    	list.add(sc.nextInt());
    }
    
    int sum = 100000000;
    int challengeSum;
    for(int i = 0; i<101; i++){
     challengeSum = 0;
      for(int j=0; j<n; j++){
        challengeSum = challengeSum + (list.get(j) - i) * (list.get(j) - i);
      }
      if(sum>challengeSum){
        sum = challengeSum;
      }
    }
 
    System.out.println(sum);
  }
}
/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