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; i++) X[i] = sc.nextInt();
    int ans = 1000000000;
    for (int i = 1; i <= 100; i++) {
      int tmp = 0;
      for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      }
      ans = Math.min(ans, tmp);
    }
    System.out.println(ans);
  }
} import java.util.*; util.* java 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; i++) X[i] = sc.nextInt();
    int ans = 1000000000;
    for (int i = 1; i <= 100; i++) {
      int tmp = 0;
      for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      }
      ans = Math.min(ans, tmp);
    }
    System.out.println(ans);
  }
} 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; i++) X[i] = sc.nextInt();
    int ans = 1000000000;
    for (int i = 1; i <= 100; i++) {
      int tmp = 0;
      for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      }
      ans = Math.min(ans, tmp);
    }
    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int[] X = new int[N];
    for (int i = 0; i < N; i++) X[i] = sc.nextInt();
    int ans = 1000000000;
    for (int i = 1; i <= 100; i++) {
      int tmp = 0;
      for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      }
      ans = Math.min(ans, tmp);
    }
    System.out.println(ans);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int[] X = new int[N]; X new int[N] N for (int i = 0; i < N; i++) X[i] = sc.nextInt(); int i = 0; int i = 0; i 0 i < N i N i++ i++ i X[i] = sc.nextInt(); X[i] = sc.nextInt() X[i] X i sc.nextInt() sc.nextInt sc int ans = 1000000000; ans 1000000000 for (int i = 1; i <= 100; i++) {
      int tmp = 0;
      for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      }
      ans = Math.min(ans, tmp);
    } int i = 1; int i = 1; i 1 i <= 100 i 100 i++ i++ i {
      int tmp = 0;
      for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      }
      ans = Math.min(ans, tmp);
    } {
      int tmp = 0;
      for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      }
      ans = Math.min(ans, tmp);
    } int tmp = 0; tmp 0 for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      } int j = 0; int j = 0; j 0 j < N j N j++ j++ j {
        tmp += (X[j] - i) * (X[j] - i);
      } {
        tmp += (X[j] - i) * (X[j] - i);
      } tmp += (X[j] - i) * (X[j] - i) tmp (X[j] - i) * (X[j] - i) (X[j] - i) X[j] X j i (X[j] - i) X[j] X j i ans = Math.min(ans, tmp) ans Math.min(ans, tmp) Math.min Math ans tmp System.out.println(ans) System.out.println System.out System System.out ans String[] args args 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; i++) X[i] = sc.nextInt();
    int ans = 1000000000;
    for (int i = 1; i <= 100; i++) {
      int tmp = 0;
      for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      }
      ans = Math.min(ans, tmp);
    }
    System.out.println(ans);
  }
} 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; i++) X[i] = sc.nextInt();
    int ans = 1000000000;
    for (int i = 1; i <= 100; i++) {
      int tmp = 0;
      for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      }
      ans = Math.min(ans, tmp);
    }
    System.out.println(ans);
  }
} Main
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; i++) X[i] = sc.nextInt();
    int ans = 1000000000;
    for (int i = 1; i <= 100; i++) {
      int tmp = 0;
      for (int j = 0; j < N; j++) {
        tmp += (X[j] - i) * (X[j] - i);
      }
      ans = Math.min(ans, tmp);
    }
    System.out.println(ans);
  }
}