#include <bits/stdc++.h>


using namespace std;

int main() {
    int n, a, count = 0;
    bool flag = false;
    vector<int> arr;
    cin >> n;
    for(int i = 0; i < n; i++){
        cin >> a;
        for (int j = 0; j < arr.size(); j++){
            if(a == arr[j]){
                flag = true;
                break;
            }
        }
        if(!flag){
            count++;
            arr.push_back(a);
        }
        flag = false;
    }
    cout << count;
    return 0;
}