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#include <bits/stdc++.h>

using namespace std;

int amounts[500007];
vector<int> counts;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);

    int length;
    cin >> length;

    for (int i = 0; i < length; ++i)
    {
        int number;
        cin >> number;
        amounts[number] += 1;
    }
    for (int i = 1; i <= length; ++i)
    {
        if (amounts[i] != 0)
            counts.push_back(amounts[i]);
    }
    sort(counts.begin(), counts.end());
    int steps = 0;
    int current = 0;
    while (current < length)
    {
        current += 2 * counts[counts.size() - 1] - 1;
        counts.pop_back();
        ++steps;
    }
    cout << steps << '\n';
}