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#include<iostream>
#include<vector>
#include<list>
#include<functional>

using namespace std;

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

	int n, a;
	cin >> n;
	vector<int> counter(n + 1, 0);

	for (int i = 0; i < n; i++) {
		cin >> a;
		counter[a]++;
	}
	sort(counter.begin(), counter.end(), greater<>());

	int result = 0;
	list<int> remaining_counters(counter.begin(), counter.end());

	while (remaining_counters.back() == 0) remaining_counters.pop_back();
	// for (auto idx = remaining_counters.begin(); idx != remaining_counters.end(); idx++) {
		// cout << *idx << " ";
	// }
	// cout << "\n";

	while (remaining_counters.size() > 0) {
		result++;
		int top = remaining_counters.front();
		remaining_counters.pop_front();
		// cout << "top " << top << "\n";
		while (remaining_counters.size() > 0 && top > 1) {
			int back = remaining_counters.back();
			// cout << "back " << back << "\n";
			remaining_counters.pop_back();
			if (back < top) {
				top -= back;
			} else {
				remaining_counters.push_back(back - top + 1);
				top = 0;
			}
		}
	}

	cout << result << "\n";
}