#include<iostream>
#include<cmath>
#include<iomanip>
#include<algorithm>
#include<cstdlib>
#include<cstring>

#define ll long long
#define sz(x) int(x.size())
using namespace std;

void Fast_IO(){
    ios_base::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin), freopen("output.txt", "w", stdout);
    #endif
}

ll count(ll arr[],ll n){
    sort(arr,arr+n);
    ll counter =1;
    for(ll i =1;i<n;i++){
        if(arr[i]!=arr[i-1]) counter++;
    }
    return counter;
}




int main(){
    Fast_IO();
int t =1;
//cin>>t;
while(t--){
ll n; cin>>n;
ll arr[n];
for(ll i =0; i<n; i++) cin>>arr[i];
cout<<count(arr,n);





}
return 0;
}