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#include <iostream>
#include <vector>
#include <set>

namespace {
	using std::ios_base, std::cin;
	using std::cout, std::vector, std::multiset;
};

int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	// Przygotowanie danych
	size_t n, m;
	cin >> n;
	vector<size_t> raw_cnts(n, 0);
	for (size_t k = 0; k < n; ++k) {
		cin >> m;
		++raw_cnts[m - 1];
	}
	multiset<size_t> cnts;
	for (auto const & c : raw_cnts)
		if (c != 0)
			cnts.insert(c);

	// Obliczenie wyniku
	size_t elem = 0, prev_min = 0;
	auto it_min = cnts.begin();
	auto it_max = cnts.rbegin();
	size_t i_min = 0, i_max = cnts.size() - 1;
	while (i_min < i_max) {
		if (*it_max > elem + *it_min - prev_min) {
			elem += *it_min;
			prev_min = 0;
			++it_min;
			++i_min;
		} else {
			prev_min = *it_max - elem - 1;
			elem = 0;
			++it_max;
			--i_max;
		}
	}
	cout << cnts.size() - i_max << '\n';
}