#include <iostream>
#include <fstream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;

int main(){


  int n,ans; cin >> n;ans = 0;
  vector<int> v(n),re(n);
  for (int i = 0; i < n; i++) {
    cin >> v[i];
  }
  for (int i = 0; i < n; i++) {
    int a = v[i] - 1;
    re[a]++;
  }
  for (int i = 0; i < n; i++) {
    if(re[i] == 1){ ans++; }
  }
  cout << ans << "\n";
  return 0;
}