#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <fstream>
#include <set>
#include <utility>
#include <algorithm>

#define rep(i,p,n) for(int i=p;i<n;i++)
#define lli long long int
#define vi vector<int> 

using namespace std;

int main() {
	int n[100001] = { 0 };
	int nn;
	cin >> nn;
	for (int i = 0; i < nn; i++) {
		int num;
		cin >> num;
		n[num]++;
	}

	int count = 0;
	for (int i = 0; i < 100000; i++) {
		if (n[i] == 1)count++;
	}

	cout << count << endl;

	return 0;
}