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

const size_t maxn = 500'000;
array<int, maxn + 1> ile_razy = {};

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

    int n;
    cin >> n;

    for (int i = 0; i < n; i++) {
        int element;
        cin >> element;

        ile_razy[element]++;
    }


    sort(ile_razy.begin(), ile_razy.end(), [](int a, int b) {
        return a > b;
    });
    
    /* 
    for (int i = 0; i < n; i++) {
        cout << ile_razy[i].first << " " << ile_razy[i].second << "\n";
    } */

    int index_gorny = 0, index_dolny = n - 1, dzielenia = 0;
    while (index_gorny <= index_dolny) {
        int pomiesci = ile_razy[index_gorny]*2 - 1;
        pomiesci -= ile_razy[index_gorny];

        for (; index_dolny > index_gorny; index_dolny--) {
            if (ile_razy[index_dolny] <= pomiesci) {
                pomiesci -= ile_razy[index_dolny];
            } else {
                ile_razy[index_dolny] -= pomiesci;
                break;
            }
        }

        index_gorny++;
        dzielenia++;
    }

    cout << dzielenia << "\n";
    return 0;
}