#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
using namespace std;
int main() {
	int n;
	cin >> n;
	vector<int> a(n, 0);
	for (int i = 0; i < n; i++) {
		cin >> a.at(i);
	}
	int col = 1;
	sort(a.begin(), a.end());
	for (int i = 1; i < n; i++) {
		if (a.at(i) != a.at(i - 1))col++;
	}
	cout << col << endl;
	return 0;
}