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#include<bits/stdc++.h>
#define FOR(i,a,b) for(int i=a;i<b;++i)
#define FORD(i,a,b) for(int i=a;i>=b;--i)
#define PB push_back
#define EB emplace_back
#define FI first
#define SE second
#define umap unordered_map
#define uset unordered_set
#define vi vector<int>
#define vvi vector<vi>
#define vll vector<ll>
#define vvll vector<vll>
#define vpii vector<pii>
#define pii pair<int, int>
#define pll pair<ll, ll>
#define ALL(X) (X).begin(),(X).end()
#ifndef DEBUG
#define endl (char)10
#endif
using namespace std;
using ll = long long;
using ld = long double;

template <class T>
istream& operator>> (istream& is, vector<T>& vec){
    FOR(i,0,vec.size()) is >> vec[i];
    return is;
}
template <class T>
ostream& operator<< (ostream& os, vector<T>& vec){
    for(auto& t : vec) os << t << " ";
    return os;
}
template<class T, class U>
ostream& operator<< (ostream& os, const pair<T, U>& p){
    os << p.FI << " " << p.SE;
    return os;
}
template<class T, class U>
istream& operator>> (istream& is, pair<T, U>& p){
    is >> p.FI >> p.SE;
    return is;
}

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    int n;
    cin >> n;
    vi V(n);
    cin >> V;
    sort(ALL(V));
    vi L;
    int ile = 1;
    V.PB(1000000);
    FOR(i,1,V.size()){
		if (V[i] != V[i - 1]){
			L.PB(ile);
			ile = 1;
		} else ile++;
	}
	sort(ALL(L), greater<int>());
	int ans = 0;
	FOR(i,0,L.size()){
		ans++;
		int j = L[i] - 1;
		while(i < L.size() - 1){
			if (j >= L.back()){
				j -= L.back();
				L.pop_back();
			} else {
				L.back() -= j;
				break;
			}
		}
	}
	cout << ans << endl;
}