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

int main () {
    int n;
    cin >> n;
    vector<int>v(n);
    for (int i = 0; i < n; i++) {
        cin >> v[i];
    }
    sort(v.begin(), v.end());
    int out =1;
    for (int i = 0; i < n; i++) {
        if (i!=0){
            if (v[i-1] != v[i]) {
                out++;
            }
        }
    }
    cout<<out;
}