#include<iostream>
using namespace std;

int main(){
	int a[100000];
	int flag=0;
	int cnt[100000] = {0};
	int count = 0;
	int n;
	cin >> n;
	for (int i1 = 0; i1 < n; i1++){
		flag = 0;
		cin >> a[i1];
		for (int i2 = 0; i2 < i1; i2++){
			if (a[i1] == a[i2]){
				cnt[i2] = 0;
				flag = 1;
				break;
			}
		}
		if (flag == 0){
			cnt[i1] = 1;
		}
	}
	for (int i3 = 0; i3 < n; i3++){
		if (cnt[i3] == 1){
			count += 1;
		}
	}


	cout << count << endl;


	return 0;
}