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#include<bits/stdc++.h>

using namespace std;

int main () {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
  int n;
  cin >> n;
  set<int> st;
  while(n--) {
    int x; cin >> x;
    st.insert(x);
  }
  cout << st.size() << '\n';
}