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#include <bits/stdc++.h>

using namespace std;

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

    int n = 0, inp = 0;
    cin >> n;

    int tab[500002] = {};

    for (int i = 1; i <= n; i++)
    {
        cin >> inp;
        tab[inp]--;
    }

    sort(tab + 1, tab + n + 2);

    int it = 1;

    while (n > 0)
    {
        n += 2 * tab[it] + 1;
        it++;
    }

    cout << it - 1;
    return 0;
}