#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main()
{
    int n;
    cin >> n;
    int arr[n];
    for (int i = 0; i < n; i++) cin >> arr[i];
    sort(arr, arr + n);
    int cnt = 1;
    for (int i = 0; i < n - 1; i++){
        if (arr[i] != arr[i + 1])
            cnt++;
    }
    cout << cnt << endl;
}