#include <bits/stdc++.h>
#define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false))
using namespace std;

int main() {
  fastIO;
  int n;
  cin >> n;
  map<int, int> mp;

  for (int i = 0; i < n; ++i) {
    int num;
    cin >> num;
    if (mp.find(num) != mp.end()) {
      mp[num]++;
    } else {
      mp[num] = 1;
    }
  }

  int cnt = 0;
  for (const auto key : mp) {
    if (key.second == 1)
      cnt++;
  }

  cout << cnt << '\n';
  return 0;
}