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#include <bits/stdc++.h>

using namespace std;

#define ll long long

#define rng(i,a,b) for(int i=int(a);i<int(b);i++)
#define rep(i,b) rng(i,0,b)

typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<vvi> vvvi;

typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<vvl> vvvl;

typedef pair<int,int> ii;

template<class t> using vc=vector<t>;
template<class t> using vvc=vc<vc<t>>;

const int MOD = 998244353;

ll read(){
    ll i;
    cin>>i;
    return i;
}

vi readvi(int n,int off=0,int shift=0){
    vi v(n+shift);
    rep(i,shift)v[i]=0;
    rep(i,n)v[i+shift]=read()+off;
    return v;
}

void YesNo(bool condition, bool do_exit=true) {
    if (condition)
        cout << "Yes" << endl;
    else
        cout << "No" << endl;
    if (do_exit)
        exit(0);
}

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

    int n;
    cin >> n;
    vi cnt = vi(n+1,0);

    rep(i,n) {
        int a;
        cin >> a;
        ++cnt[a];
    }

    vi v;
    for (auto c : cnt)
        if (c > 0)
            v.push_back(c);

    sort(v.begin(), v.end(), greater<int>());

    int i = 0;
    int j = v.size()-1;

    int res = 0;

    while (i <= j) {
        ++res;

        int other = 0;
        while (i<j and other < v[i] - 1) {
            int add = min(v[j], v[i] - 1 - other);
            other += add;
            v[j] -= add;
            if (v[j] == 0)
                --j;
        }
        ++i;
    }


    cout << res << "\n";

    return 0;
}