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#include "bits/stdc++.h"
using namespace std;
#define all(x) x.begin(),x.end()
template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) { return os << p.first << " " << p.second; }
template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) { string sep; for (const T &x : v) os << sep << x, sep = " "; return os; }
#ifdef LOCAL
#include "debug.h"
#else
#define debug(...) 42
#define ASSERT(...) 42
#endif
typedef long long ll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int,int> pi;
const int oo = 1e9;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n; cin >> n;
    vi cnt(n);
    for(int i=0;i<n;++i) {
        int a; cin >> a;
        cnt[a-1]++;
    }
    vi ccnt(n+1);
    for(int i=0;i<n;++i) ccnt[cnt[i]]+=1;
    int total=0;
    int ans=0;
    for(int v=n;v>=1;--v) {
        while(ccnt[v]--) {
            total+=v*2-1;
            ans++;
            if(total>=n) break;
        }
        if(total>=n) break;
    }
    cout << ans << '\n';
    
}