1
#include <bits/stdc++.h>
2
 
3
using namespace std;
4
 
5
int main() {
6
    std::ios_base::sync_with_stdio(false);
7
    cin.tie(0);
8
    cout.tie(0);
9
    int n;
10
    cin >> n;
11
    int a[n];
12
    for (int i = 0; i < n; ++i) {
13
        cin >> a[i];
14
    }
15
    sort(a + 0, a + n);
16
    
17
    int cnt = 1;
18
    
19
    for (int i = 1; i < n; ++i) {
20
        if (a[i - 1] != a[i]) {
21
            cnt++;
22
        }
23
    }
24
    
25
    cout << cnt;
26
    return 0;
27
}
28