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#include <bits/stdc++.h>

using namespace std;

#define JOIN_(X, Y) X##Y
#define JOIN(X, Y) JOIN_(X, Y)
#define TMP JOIN(tmp, __LINE__)
#define PB push_back
#define SZ(x) int((x).size())
#define REP(i, n) for (int i = 0, TMP = (n); i < TMP; ++i)
#define FOR(i, a, b) for (int i = (a), TMP = (b); i <= TMP; ++i)
#define FORD(i, a, b) for (int i = (a), TMP = (b); i >= TMP; --i)

#ifdef DEBUG
#define DEB(x) (cerr << x)
#else
#define DEB(x)
#endif

typedef long long ll;
typedef vector<int> vi;
typedef pair<int, int> pii;

const int INF = 1e9 + 9;

int t[500001];

void inline one() {
    int n;
    cin >> n;
    REP(i, n) {
        int x;
        cin >> x;
        ++t[x];
    }
    sort(t, t + (n + 1), greater());
    deque<int> q;
    REP(i, n + 1) {
        DEB("i=" << i << " : " << t[i] << "\n");
        if (t[i] > 0) {
            q.push_back(t[i]);
        }
    }
    int result = 0;
    while (not q.empty()) {
        int left = q.front() - 1;
        q.pop_front();
        ++result;
        while (not q.empty() and left > 0) {
            int back = q.back();
            q.pop_back();
            int used = min(left, back);
            left -= used;
            back -= used;
            if (back > 0) {
                q.push_back(back);
            }
        }
    }
    cout << result << "\n";
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    // int z; cin >> z; while(z--)
    one();
}