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

#ifdef DEBUG
#include "debug.h"
#else
#define debug(...) 42
#endif

#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)

#define rep(i, n) for (int i = 0; i < (n); ++i)
#define repp(i, n, m) for (int i = (n); i < (m); ++i)

#define repr(i, n) for (int i = (n) - 1; i >= 0; --i)
#define reppr(i, n, m) for (int i = (m) - 1; i >= (n); --i)

#define each(a,x) for(auto& a : (x))
#define sz(x) int((x).size())

using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;
using pi = pair<int, int>;
using pll = pair<ll, ll>;

template <typename T, typename V> void mini(T& a, V b) {if (b < a) a = b; }
template <typename T, typename V> void maxi(T& a, V b) {if (b > a) a = b; }

void solve() {
    int n, ans = 0;
    cin >> n;
    deque<int> freq(n);

    rep(_, n) {
        int x;
        cin >> x;
        --x;
        ++freq[x];
    }

    sort(all(freq));

    while (sz(freq)) {
        int big = freq.back();
        freq.pop_back();

        if (big == 0)
            continue;
        --big;
        // big liczb można ubić
        while (sz(freq) && big) {
            int kill = min(big, freq[0]);
            big -= kill;
            freq[0] -= kill;
            if (freq[0] == 0)
                freq.pop_front();
        }

        ++ans;
    }

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

int main() {
#ifndef DEBUG
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
#endif
    int z = 1;
    // cin >> z;
    while (z--)
        solve();
    return 0;
}