import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;

public class Main {

  public static void main(String[] args) {
    FastScanner sc = new FastScanner();

    int N = sc.nextInt();
    int[] x = new int[N];

    int m = 0;
    for (int i = 0; i < N; i++) {
      x[i] = sc.nextInt();
      m = Math.max(x[i], m);
    }

    int ans = Integer.MAX_VALUE;
    for (int i = 0; i <= m; i++) {
      int t = 0;
      for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      }
      ans = Math.min(t, ans);
    }

    System.out.println(ans);

  }
}

class FastScanner {
  private final InputStream in = System.in;
  private final byte[] buffer = new byte[1024];
  private int ptr = 0;
  private int buflen = 0;

  private boolean hasNextByte() {
    if (ptr < buflen) {
      return true;
    } else {
      ptr = 0;
      try {
        buflen = in.read(buffer);
      } catch (IOException e) {
        e.printStackTrace();
      }
      if (buflen <= 0) {
        return false;
      }
    }
    return true;
  }

  private int readByte() {
    if (hasNextByte()) {
      return buffer[ptr++];
    } else {
      return -1;
    }
  }

  private static boolean isPrintableChar(int c) {
    return 33 <= c && c <= 126;
  }

  private void skipUnprintable() {
    while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
      ptr++;
    }
  }

  public boolean hasNext() {
    skipUnprintable();
    return hasNextByte();
  }

  public String next() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    StringBuilder sb = new StringBuilder();
    int b = readByte();
    while (isPrintableChar(b)) {
      sb.appendCodePoint(b);
      b = readByte();
    }
    return sb.toString();
  }

  public int nextInt() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    int n = 0;
    boolean minus = false;
    int b = readByte();
    if (b == '-') {
      minus = true;
      b = readByte();
    }
    if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    }
    while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    }
  }

  public long nextLong() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    long n = 0;
    boolean minus = false;
    int b = readByte();
    if (b == '-') {
      minus = true;
      b = readByte();
    }
    if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    }
    while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    }
  }
} import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.util.NoSuchElementException; NoSuchElementException java.util public class Main {

  public static void main(String[] args) {
    FastScanner sc = new FastScanner();

    int N = sc.nextInt();
    int[] x = new int[N];

    int m = 0;
    for (int i = 0; i < N; i++) {
      x[i] = sc.nextInt();
      m = Math.max(x[i], m);
    }

    int ans = Integer.MAX_VALUE;
    for (int i = 0; i <= m; i++) {
      int t = 0;
      for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      }
      ans = Math.min(t, ans);
    }

    System.out.println(ans);

  }
} Main public static void main(String[] args) {
    FastScanner sc = new FastScanner();

    int N = sc.nextInt();
    int[] x = new int[N];

    int m = 0;
    for (int i = 0; i < N; i++) {
      x[i] = sc.nextInt();
      m = Math.max(x[i], m);
    }

    int ans = Integer.MAX_VALUE;
    for (int i = 0; i <= m; i++) {
      int t = 0;
      for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      }
      ans = Math.min(t, ans);
    }

    System.out.println(ans);

  } main {
    FastScanner sc = new FastScanner();

    int N = sc.nextInt();
    int[] x = new int[N];

    int m = 0;
    for (int i = 0; i < N; i++) {
      x[i] = sc.nextInt();
      m = Math.max(x[i], m);
    }

    int ans = Integer.MAX_VALUE;
    for (int i = 0; i <= m; i++) {
      int t = 0;
      for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      }
      ans = Math.min(t, ans);
    }

    System.out.println(ans);

  } FastScanner sc = new FastScanner(); sc new FastScanner() int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int[] x = new int[N]; x new int[N] N int m = 0; m 0 for (int i = 0; i < N; i++) {
      x[i] = sc.nextInt();
      m = Math.max(x[i], m);
    } int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
      x[i] = sc.nextInt();
      m = Math.max(x[i], m);
    } {
      x[i] = sc.nextInt();
      m = Math.max(x[i], m);
    } x[i] = sc.nextInt() x[i] x i sc.nextInt() sc.nextInt sc m = Math.max(x[i], m) m Math.max(x[i], m) Math.max Math x[i] x i m int ans = Integer.MAX_VALUE; ans Integer.MAX_VALUE Integer Integer.MAX_VALUE for (int i = 0; i <= m; i++) {
      int t = 0;
      for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      }
      ans = Math.min(t, ans);
    } int i = 0; int i = 0; i 0 i <= m i m i++ i++ i {
      int t = 0;
      for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      }
      ans = Math.min(t, ans);
    } {
      int t = 0;
      for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      }
      ans = Math.min(t, ans);
    } int t = 0; t 0 for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      } int j = 0; int j = 0; j 0 j < N j N j++ j++ j {
        t += (x[j] - i) * (x[j] - i);
      } {
        t += (x[j] - i) * (x[j] - i);
      } t += (x[j] - i) * (x[j] - i) t (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(t, ans) ans Math.min(t, ans) Math.min Math t ans System.out.println(ans) System.out.println System.out System System.out ans String[] args args class FastScanner {
  private final InputStream in = System.in;
  private final byte[] buffer = new byte[1024];
  private int ptr = 0;
  private int buflen = 0;

  private boolean hasNextByte() {
    if (ptr < buflen) {
      return true;
    } else {
      ptr = 0;
      try {
        buflen = in.read(buffer);
      } catch (IOException e) {
        e.printStackTrace();
      }
      if (buflen <= 0) {
        return false;
      }
    }
    return true;
  }

  private int readByte() {
    if (hasNextByte()) {
      return buffer[ptr++];
    } else {
      return -1;
    }
  }

  private static boolean isPrintableChar(int c) {
    return 33 <= c && c <= 126;
  }

  private void skipUnprintable() {
    while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
      ptr++;
    }
  }

  public boolean hasNext() {
    skipUnprintable();
    return hasNextByte();
  }

  public String next() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    StringBuilder sb = new StringBuilder();
    int b = readByte();
    while (isPrintableChar(b)) {
      sb.appendCodePoint(b);
      b = readByte();
    }
    return sb.toString();
  }

  public int nextInt() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    int n = 0;
    boolean minus = false;
    int b = readByte();
    if (b == '-') {
      minus = true;
      b = readByte();
    }
    if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    }
    while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    }
  }

  public long nextLong() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    long n = 0;
    boolean minus = false;
    int b = readByte();
    if (b == '-') {
      minus = true;
      b = readByte();
    }
    if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    }
    while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    }
  }
} FastScanner private final InputStream in = System.in; in System.in System System.in private final byte[] buffer = new byte[1024]; buffer new byte[1024] 1024 private int ptr = 0; ptr 0 private int buflen = 0; buflen 0 private boolean hasNextByte() {
    if (ptr < buflen) {
      return true;
    } else {
      ptr = 0;
      try {
        buflen = in.read(buffer);
      } catch (IOException e) {
        e.printStackTrace();
      }
      if (buflen <= 0) {
        return false;
      }
    }
    return true;
  } hasNextByte {
    if (ptr < buflen) {
      return true;
    } else {
      ptr = 0;
      try {
        buflen = in.read(buffer);
      } catch (IOException e) {
        e.printStackTrace();
      }
      if (buflen <= 0) {
        return false;
      }
    }
    return true;
  } if (ptr < buflen) {
      return true;
    } else {
      ptr = 0;
      try {
        buflen = in.read(buffer);
      } catch (IOException e) {
        e.printStackTrace();
      }
      if (buflen <= 0) {
        return false;
      }
    } ptr < buflen ptr buflen {
      return true;
    } return true; true {
      ptr = 0;
      try {
        buflen = in.read(buffer);
      } catch (IOException e) {
        e.printStackTrace();
      }
      if (buflen <= 0) {
        return false;
      }
    } ptr = 0 ptr 0 try {
        buflen = in.read(buffer);
      } catch (IOException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      } IOException e {
        e.printStackTrace();
      } e.printStackTrace() e.printStackTrace e {
        buflen = in.read(buffer);
      } buflen = in.read(buffer) buflen in.read(buffer) in.read in buffer if (buflen <= 0) {
        return false;
      } buflen <= 0 buflen 0 {
        return false;
      } return false; false return true; true private int readByte() {
    if (hasNextByte()) {
      return buffer[ptr++];
    } else {
      return -1;
    }
  } readByte {
    if (hasNextByte()) {
      return buffer[ptr++];
    } else {
      return -1;
    }
  } if (hasNextByte()) {
      return buffer[ptr++];
    } else {
      return -1;
    } hasNextByte() hasNextByte {
      return buffer[ptr++];
    } return buffer[ptr++]; buffer[ptr++] buffer ptr++ ptr {
      return -1;
    } return -1; -1 1 private static boolean isPrintableChar(int c) {
    return 33 <= c && c <= 126;
  } isPrintableChar {
    return 33 <= c && c <= 126;
  } return 33 <= c && c <= 126; 33 <= c && c <= 126 33 <= c 33 c c <= 126 c 126 int c c private void skipUnprintable() {
    while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
      ptr++;
    }
  } skipUnprintable {
    while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
      ptr++;
    }
  } while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
      ptr++;
    } hasNextByte() && !isPrintableChar(buffer[ptr]) hasNextByte() hasNextByte !isPrintableChar(buffer[ptr]) isPrintableChar(buffer[ptr]) isPrintableChar buffer[ptr] buffer ptr {
      ptr++;
    } ptr++ ptr public boolean hasNext() {
    skipUnprintable();
    return hasNextByte();
  } hasNext {
    skipUnprintable();
    return hasNextByte();
  } skipUnprintable() skipUnprintable return hasNextByte(); hasNextByte() hasNextByte public String next() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    StringBuilder sb = new StringBuilder();
    int b = readByte();
    while (isPrintableChar(b)) {
      sb.appendCodePoint(b);
      b = readByte();
    }
    return sb.toString();
  } next {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    StringBuilder sb = new StringBuilder();
    int b = readByte();
    while (isPrintableChar(b)) {
      sb.appendCodePoint(b);
      b = readByte();
    }
    return sb.toString();
  } if (!hasNext()) {
      throw new NoSuchElementException();
    } !hasNext() hasNext() hasNext {
      throw new NoSuchElementException();
    } throw new NoSuchElementException(); new NoSuchElementException() StringBuilder sb = new StringBuilder(); sb new StringBuilder() int b = readByte(); b readByte() readByte while (isPrintableChar(b)) {
      sb.appendCodePoint(b);
      b = readByte();
    } isPrintableChar(b) isPrintableChar b {
      sb.appendCodePoint(b);
      b = readByte();
    } sb.appendCodePoint(b) sb.appendCodePoint sb b b = readByte() b readByte() readByte return sb.toString(); sb.toString() sb.toString sb public int nextInt() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    int n = 0;
    boolean minus = false;
    int b = readByte();
    if (b == '-') {
      minus = true;
      b = readByte();
    }
    if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    }
    while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    }
  } nextInt {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    int n = 0;
    boolean minus = false;
    int b = readByte();
    if (b == '-') {
      minus = true;
      b = readByte();
    }
    if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    }
    while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    }
  } if (!hasNext()) {
      throw new NoSuchElementException();
    } !hasNext() hasNext() hasNext {
      throw new NoSuchElementException();
    } throw new NoSuchElementException(); new NoSuchElementException() int n = 0; n 0 boolean minus = false; minus false int b = readByte(); b readByte() readByte if (b == '-') {
      minus = true;
      b = readByte();
    } b == '-' b '-' {
      minus = true;
      b = readByte();
    } minus = true minus true b = readByte() b readByte() readByte if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    } b < '0' || '9' < b b < '0' b '0' '9' < b '9' b {
      throw new NumberFormatException();
    } throw new NumberFormatException(); new NumberFormatException() while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    } true {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    } if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      } '0' <= b && b <= '9' '0' <= b '0' b b <= '9' b '9' {
        n *= 10;
        n += b - '0';
      } n *= 10 n 10 n += b - '0' n b - '0' b '0' if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      } b == -1 || !isPrintableChar(b) b == -1 b -1 1 !isPrintableChar(b) isPrintableChar(b) isPrintableChar b {
        return minus ? -n : n;
      } return minus ? -n : n; minus ? -n : n minus -n n n {
        throw new NumberFormatException();
      } throw new NumberFormatException(); new NumberFormatException() b = readByte() b readByte() readByte public long nextLong() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    long n = 0;
    boolean minus = false;
    int b = readByte();
    if (b == '-') {
      minus = true;
      b = readByte();
    }
    if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    }
    while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    }
  } nextLong {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    long n = 0;
    boolean minus = false;
    int b = readByte();
    if (b == '-') {
      minus = true;
      b = readByte();
    }
    if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    }
    while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    }
  } if (!hasNext()) {
      throw new NoSuchElementException();
    } !hasNext() hasNext() hasNext {
      throw new NoSuchElementException();
    } throw new NoSuchElementException(); new NoSuchElementException() long n = 0; n 0 boolean minus = false; minus false int b = readByte(); b readByte() readByte if (b == '-') {
      minus = true;
      b = readByte();
    } b == '-' b '-' {
      minus = true;
      b = readByte();
    } minus = true minus true b = readByte() b readByte() readByte if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    } b < '0' || '9' < b b < '0' b '0' '9' < b '9' b {
      throw new NumberFormatException();
    } throw new NumberFormatException(); new NumberFormatException() while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    } true {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    } if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      } '0' <= b && b <= '9' '0' <= b '0' b b <= '9' b '9' {
        n *= 10;
        n += b - '0';
      } n *= 10 n 10 n += b - '0' n b - '0' b '0' if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      } b == -1 || !isPrintableChar(b) b == -1 b -1 1 !isPrintableChar(b) isPrintableChar(b) isPrintableChar b {
        return minus ? -n : n;
      } return minus ? -n : n; minus ? -n : n minus -n n n {
        throw new NumberFormatException();
      } throw new NumberFormatException(); new NumberFormatException() b = readByte() b readByte() readByte public class Main {

  public static void main(String[] args) {
    FastScanner sc = new FastScanner();

    int N = sc.nextInt();
    int[] x = new int[N];

    int m = 0;
    for (int i = 0; i < N; i++) {
      x[i] = sc.nextInt();
      m = Math.max(x[i], m);
    }

    int ans = Integer.MAX_VALUE;
    for (int i = 0; i <= m; i++) {
      int t = 0;
      for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      }
      ans = Math.min(t, ans);
    }

    System.out.println(ans);

  }
} public class Main {

  public static void main(String[] args) {
    FastScanner sc = new FastScanner();

    int N = sc.nextInt();
    int[] x = new int[N];

    int m = 0;
    for (int i = 0; i < N; i++) {
      x[i] = sc.nextInt();
      m = Math.max(x[i], m);
    }

    int ans = Integer.MAX_VALUE;
    for (int i = 0; i <= m; i++) {
      int t = 0;
      for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      }
      ans = Math.min(t, ans);
    }

    System.out.println(ans);

  }
} Main
import java.io.IOException;
import java.io.InputStream;
import java.util.NoSuchElementException;

public class Main {

  public static void main(String[] args) {
    FastScanner sc = new FastScanner();

    int N = sc.nextInt();
    int[] x = new int[N];

    int m = 0;
    for (int i = 0; i < N; i++) {
      x[i] = sc.nextInt();
      m = Math.max(x[i], m);
    }

    int ans = Integer.MAX_VALUE;
    for (int i = 0; i <= m; i++) {
      int t = 0;
      for (int j = 0; j < N; j++) {
        t += (x[j] - i) * (x[j] - i);
      }
      ans = Math.min(t, ans);
    }

    System.out.println(ans);

  }
}

class FastScanner {
  private final InputStream in = System.in;
  private final byte[] buffer = new byte[1024];
  private int ptr = 0;
  private int buflen = 0;

  private boolean hasNextByte() {
    if (ptr < buflen) {
      return true;
    } else {
      ptr = 0;
      try {
        buflen = in.read(buffer);
      } catch (IOException e) {
        e.printStackTrace();
      }
      if (buflen <= 0) {
        return false;
      }
    }
    return true;
  }

  private int readByte() {
    if (hasNextByte()) {
      return buffer[ptr++];
    } else {
      return -1;
    }
  }

  private static boolean isPrintableChar(int c) {
    return 33 <= c && c <= 126;
  }

  private void skipUnprintable() {
    while (hasNextByte() && !isPrintableChar(buffer[ptr])) {
      ptr++;
    }
  }

  public boolean hasNext() {
    skipUnprintable();
    return hasNextByte();
  }

  public String next() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    StringBuilder sb = new StringBuilder();
    int b = readByte();
    while (isPrintableChar(b)) {
      sb.appendCodePoint(b);
      b = readByte();
    }
    return sb.toString();
  }

  public int nextInt() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    int n = 0;
    boolean minus = false;
    int b = readByte();
    if (b == '-') {
      minus = true;
      b = readByte();
    }
    if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    }
    while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    }
  }

  public long nextLong() {
    if (!hasNext()) {
      throw new NoSuchElementException();
    }
    long n = 0;
    boolean minus = false;
    int b = readByte();
    if (b == '-') {
      minus = true;
      b = readByte();
    }
    if (b < '0' || '9' < b) {
      throw new NumberFormatException();
    }
    while (true) {
      if ('0' <= b && b <= '9') {
        n *= 10;
        n += b - '0';
      } else if (b == -1 || !isPrintableChar(b)) {
        return minus ? -n : n;
      } else {
        throw new NumberFormatException();
      }
      b = readByte();
    }
  }
}