#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <complex>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <set>
#include <stack>
#include <unordered_map>
#include <unordered_set>
#include <queue>

using namespace std;

struct BoolName : numpunct<char> {
  string t, f;
  BoolName (string t = "Yes", string f = "No") : t(t), f(f) {}
  string do_truename() const {return t;}
  string do_falsename() const {return f;}
};

struct Initializer {
  Initializer() {
    cin.tie(0);
    ios::sync_with_stdio(0);
    cout << fixed << setprecision(15) << boolalpha;
    cout.imbue(locale(cout.getloc(), new BoolName));
  }
} initializer;

template<typename T> istream& operator>>(istream &s, vector<T> &v) {
  for (T &t : v) s >> t;
  return s;
}

template<typename T> ostream& operator<<(ostream &s, const vector<T> &v) {
  for (const T &t : v) s << t << endl;
  return s;
}

void set_bool_name(string t, string f) {
  cout.imbue(locale(cout.getloc(), new BoolName(t, f)));
}

template<typename T> bool chmin(T& a, T b) {return a > b ? a = b, true : false;}

template<typename T> bool chmax(T& a, T b) {return a < b ? a = b, true : false;}

template<typename T> void sort(vector<T>& v) {sort(v.begin(), v.end());}

template<typename T> int least_bit(T n) {
  static_assert(sizeof(T) == 4 || sizeof(T) == 8, "unsupported size");
  if (sizeof(T) == 4) return __builtin_ffs(n) - 1;
  if (sizeof(T) == 8) return __builtin_ffsll(n) - 1;
}

// n must be greater than 0.
template<typename T> int least_bit_fast(T n) {
  static_assert(sizeof(T) == 4 || sizeof(T) == 8, "unsupported size");
  if (sizeof(T) == 4) return __builtin_ctz(n);
  if (sizeof(T) == 8) return __builtin_ctzll(n);
}

template<typename T> int most_bit(T n) {
  static_assert(sizeof(T) == 4 || sizeof(T) == 8, "unsupported size");
  if (sizeof(T) == 4) return n ? 31 - __builtin_clz(n) : -1;
  if (sizeof(T) == 8) return n ? 63 - __builtin_clzll(n) : -1;
}

template<typename T> int count_bit(T n) {
  static_assert(sizeof(T) == 4 || sizeof(T) == 8, "unsupported size");
  if (sizeof(T) == 4) return __builtin_popcount(n);
  if (sizeof(T) == 8) return __builtin_popcountll(n);
}

template<typename T> class BitIterator : public iterator<input_iterator_tag, int> {
public:

  class Iterator : public iterator<input_iterator_tag, int> {
  private:
    int val;
    T bit;

  public:
    Iterator(int val, T bit) : val(val), bit(bit) {}

    Iterator operator*() {return *this;}

    bool operator!=(const Iterator& itr) const {return val != itr.val;}

    void operator++() {val = least_bit(bit & -(T(1) << (val + 1)));}

    operator int() {return val;}
  };
  
  Iterator i, n;
  T bit;

  BitIterator(T n) : i(least_bit(n), n), n(-1, n), bit(n) {}

  bool operator!=(const BitIterator& itr) const {return i != itr.i;}

  void operator++() {*this = BitIterator(bit + 1);}

  operator T() const {return bit;}

  bool in(int i) const {return bit & (1 << i);}

  Iterator& begin() {return i;}

  Iterator& end() {return n;}
};

int main() {
  int64_t n, k, res = 0, s = 0;
  cin >> n >> k;
  vector<int64_t> a(n);
  cin >> a;
  for (auto i : a) res += k ^ i;
  for (int64_t i = 1; i <= k; i *= 2) {
    int64_t r = 0, c = 0;
    for (auto j : a) r += ((j ^ k) & -2 * i) + (j & i);
    if (k & i) chmax(res, r + s);
    for (auto j : a) {
      if (j & i) ++c;
    }
    s += max(c, n - c) * i;
  }
  cout << res << endl;
}



Measured memory_bytes: 1024