#include<bits/stdc++.h>
namespace {
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-function"
#include<atcoder/all>
#pragma GCC diagnostic pop
using namespace std;
using namespace atcoder;
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }
template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }
using ll = long long;
using P = pair<int,int>;
using VI = vector<int>;
using VVI = vector<VI>;
using VL = vector<ll>;
using VVL = vector<VL>;

} int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  int n;
  cin >> n;
  VI a0, a1;
  rep(i, n) {
    int x;
    cin >> x;
    if (__builtin_parity(x)) a1.emplace_back(x);
    else a0.emplace_back(x);
  }
  int s0 = a0.size(), s1 = a1.size();
  int src = s0 + s1, snk = src + 1;
  mf_graph<int> g(snk + 1);
  rep(i, s0) g.add_edge(src, i, 1);
  rep(j, s1) g.add_edge(s0 + j, snk, 1);
  rep(i, s0) rep(j, s1) {
    int x = a0[i] ^ a1[j];
    if (x == (x & -x)) g.add_edge(i, s0 + j, 1);
  }
  g.flow(src, snk);
  auto cut = g.min_cut(src);
  int ans = 0;
  rep(i, s0) if (cut[i]) ans++;
  rep(j, s1) if (!cut[s0 + j]) ans++;
  cout << ans << '\n';
}