#include <bits/stdc++.h>
using namespace std;
int main(){
	ios::sync_with_stdio(false);
	cin.tie(0);
	int n, c{};
	cin >> n;
	if(1 == n){cout << 1 << "\n"; return 0;}
	vector<int> v(n);
	for(auto && e : v) cin >> e;
	sort(v.begin(), v.end());
	if(v[0] != v[1]) ++c;
	if(v[n - 2] != v[n - 1]) ++c;
	if(n < 3){cout << c << "\n"; return 0;};
	for(auto && i1 = v.begin(), i2 = v.begin() + 1, i3 = v.begin() + 2; i3 != v.end(); ++i1, ++i2, ++i3)
		if(*i1 != *i2 && *i2 != *i3) ++c;
	cout << c << "\n";
}