import java.util.Scanner;

public class Main {
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int num_of_list = sc.nextInt();
        int[] number_list = new int[num_of_list];
        for(int i = 0;i < num_of_list;i++){
            number_list[i] = sc.nextInt();
        }
        int smallest = Integer.MAX_VALUE;
        for(int i = 0;i < 100;i++){
            int total = 0;
            for(int j = 0;j < num_of_list;j++){
                total += (number_list[j]-(i+1))*(number_list[j]-(i+1));
            }
            if(total<smallest){
                smallest = total;
            }
        }
        System.out.println(smallest);
    }
}
/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