#include<iostream>
#include<algorithm>
using namespace std;

int main()
{
    int n;
    cin >> n;

    int arr[n];

    for(int i = 0; i <n; i++){
        cin >> arr[i];
    }

    sort(arr, arr+n);

    int a {1};
    int l {};

    for(int i = 0; i < n; i++){
        if(arr[i] != arr[l]){
            a++;
            l = i;
        }
    }

    cout << a << endl;



}