include [HTML_REMOVED]

using namespace std;

const int N=1010;
int a[N];

int get_unique_count(int a[],int n)
{
sort(a,a+n);

return unique(a,a+n)-a;

}

int main()
{
int n;
cin >> n;
for(int i=0;i[HTML_REMOVED]> x;
a[i]=x;
}

cout <<get_unique_count(a,n);

return 0;

}