#include <cstdio>
#include <vector>
#include <iostream>
#include <cassert>
#include <cstring>
#include <map>

using namespace std;
typedef long long ll;

const int MN = 100100;
int a[MN];
map<int, int> mp;
int main() {
    int n;
    cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a[i];
        mp[a[i]]++;
    }
    int res = 0;
    for (int i = 0; i < n; i++) {
        if (mp[a[i]] == 1) res++;
    }
    cout << res << endl;
    return 0;
}