#include <atcoder/maxflow>
#include <iostream>

using namespace std;
using namespace atcoder;

int popcount(int a) {
	if (a == 0) return 0;
	return popcount(a / 2) + a % 2;
}

int main() {
    int n;
    cin >> n;
	assert(1 <= n && n <= 2000);
    vector<int> a(n);
    for (int i = 0; i < n; ++i) {
    	cin >> a[i];
    	assert(0 <= a[i] && a[i] < 1 << 30);
    }
    
    mf_graph<int> g(n + 2);
    int s = n;
	int t = n + 1;

    for (int i = 0; i < n; ++i) {
    	for (int j = 0; j < n; ++j) {
    		if (popcount(a[i]) % 2 == 0 && popcount(a[j]) % 2 == 1 && popcount(a[i] ^ a[j]) ==1) {
    			g.add_edge(i, j, 1);	
    		}
    	}
    }
	
	for (int i = 0; i < n; ++i) if (popcount(a[i]) % 2 == 0) g.add_edge(s, i, 1);
	for (int i = 0; i < n; ++i) if (popcount(a[i]) % 2 == 1) g.add_edge(i, t, 1);

	cout << n-g.flow(s, t) << endl;
    return 0;
}