#include <bits/stdc++.h>
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define MOD 1000000007
#define int long long
using namespace std;
typedef long long ll;
typedef vector<vector<ll>> mat;
const int INF = 1e9;



signed main()
{
    int N;
    int A;
    map<int, int> cnt;

    cin >> N;
    int ans = 0;
    REP(i,N) {
        cin >> A;
        cnt[A]++;
        if (cnt[A] == 1) ans++;
        else if (cnt[A] == 2) ans--;
    }

    cout << ans << endl;
}