#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <iomanip>
#include <cmath>
#include <functional>
using namespace std;
#define diff(x,y) ((x > y) ? (x - y) : (y - x))
#define us(x) (x > 0) ? x : x * -1
#define lli long long int

int main() {
	int n, x = 0;
	cin >> n;
	vector <bool> ans(n,true);
	vector <int> a(n);
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	sort(a.begin(), a.end());
	for (int i = 0; i < n - 1; i++) {
		if (a[i] == a[i + 1]) {
			ans[i] = false;
			ans[i + 1] = false;
		}
	}
	for (int i = 0; i < n; i++) {
		if (ans[i])	x++;
	}
	cout << x << endl;
	return 0;
}