#include <algorithm>
#include <cstdio>
#include <iostream>
#include <map>
#include <set>
#include <string>
#include <vector>
#define rep(i, n) for (int i = 0; i < n; ++i)
#define FOR(i, a, b) for (int i = a; i < b; ++i)
#define ll long long
#define pb(x) push_back(x)
using namespace std;

int main() {
  int n;
  cin >> n;
  int a[n];
  rep(i, n) cin>> a[i];
  int cnt = 0;
  rep(i, n) {
    bool flg = false;
    rep(j, n) {
      if(a[i] == a[j] && i != j) {
        flg = !flg;
      }
  　}
    if (flg) cnt++;
  }
  cout << cnt << endl;
  return 0;
}