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// Autor: Wiktor Kotala
#include <bits/stdc++.h>

using namespace std;

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

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

    for(int i = 0; i < n; i++) {
        int a;
        cin >> a;
        freq[a]++;
    }

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

    int ans = 0;
    for(auto it = freq.rbegin(); n > 0; it++) {
        n -= *it + 1;
        ans++;
    }

    cout << ans << '\n';
    return 0;
}