//  Distinct Numbers

#include<bits/stdc++.h>

using namespace std;
using ll = long long;

int main() {
    int count = 1;
    int n; cin >> n;
    vector<ll> i(n);
    for (auto &e: i) cin >> e;
    std::sort(i.begin(), i.end());
    for (int j = 1; j < i.size(); j++) {
        if (i[j] != i[j-1]) count ++;
    }
    cout << count << endl;
    return 0;
}