#include <bits/stdc++.h>
using namespace std;

int main() {
//	ifstream cin("tests/0a.in");

	cin.tie(NULL);
	cout.tie(NULL);
	ios_base::sync_with_stdio(false);

	int n, tmp;
	cin >> n;
	map<int, int> counterMap;
	for (int i = 0; i < n; i++) {
		cin >> tmp;
		counterMap[tmp]++;
	}

	vector<int> counter;

	for (map<int, int>::iterator it = counterMap.begin();
			it != counterMap.end(); ++it) {
		counter.push_back(it->second);
	}

	sort(counter.begin(), counter.end());

	int minimalSequencesCount = 0;
	int frontIndex = 0;
	int liderIndex = counter.size();

	while (liderIndex > frontIndex) {
		liderIndex--;
		minimalSequencesCount++;
		tmp = counter[liderIndex] - 1;
		for (; frontIndex < liderIndex; frontIndex++) {
			if (counter[frontIndex] <= tmp) {
				tmp -= counter[frontIndex];
			} else {
				counter[frontIndex] -= tmp;
				break;
			}
		}
	}

	cout << minimalSequencesCount << endl; // prints
	return 0;
}