#include <bits/stdc++.h>
using namespace std;
int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    unsigned n,c;
    unordered_map<unsigned,unsigned> h;
    cin >> n;
    while(cin >> n)
        if(h[n]==0) {++c;h[n]++;}else if(h[n]==1){--c;h[n]++;};
    cout << c << endl;
}