#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++) cin >> a.at(i);
    sort(a.begin(), a.end());
    int ans = 0, d = 1;
    for (int i = 1; i < n; i++) {
        if (a.at(i) == a.at(i - 1)) {
            d = 0;
        } else {
            ans += d;
            d = 1;
        }
    }
    ans += d;
    cout << ans << endl;
}