#include<iostream>
#include<cstdio>
#include<map>
using namespace std;

int main() {
	int n, a[100000];
	cin >> n;

	map<int, int> mp;
	for (int i = 0; i < n; i++)
	{
		cin >> a[i];
		mp[a[i]] += 1;
	}

	int ans = 0;
	for (auto i = mp.begin(); i != mp.end(); i++)
	{
		if (i->second == 1)
		{
			ans++;
		}
	}
	cout << ans << endl;

	return 0;
}