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#include <bits/stdc++.h>

using namespace std;

#ifdef LOCAL
#include "debug.h"
#else
#define debug(...)
#endif

#define x first
#define y second
#define ir(a, x, b) ((a) <= (x) && (x) <= (b))
#define vec vector
#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define all(x) (x).begin(), (x).end()

using ll = long long;

int main() {
    ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    int n;
    cin >> n;
    vec<int> a(n);
    rep(i,0,n) {
        cin >> a[i];
    }
    sort(all(a));
    int ct = 1;
    vec<int> cts;
    rep (i, 1, n) {
        if (a[i] != a[i-1]) {
            cts.push_back(ct);
            ct = 0;
        }
        ct++;
    }
    cts.push_back(ct);
    sort(all(cts), greater<int>());
    debug(cts);
    int s = 0;
    rep (i, 0, cts.size()) {
        s += 2*cts[i]-1;
        if (s >= n) {
            cout << i+1 << "\n";
            return 0;
        }
    }
    return 0;
}