#include "bits/stdc++.h"
using namespace std;

int main() {
	int N, A, count = 0;
	map<int, int> mp;
	cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> A;
		if (mp[A] == 0) count++;
		else if (mp[A] == 1) count--;
		mp[A]++;
	}
	cout << count << endl;
}