#include <bits/stdc++.h>

#define ndl '\n'
#define ll long long
#define INF 1000000007
#define st first
#define nd second
#define debug(x) cout << #x << ": " << x << ndl
#define pb push_back
#define pob pop_back
#define pf push_front
#define pof pop_front
#define lb lower_bound
#define ub upper_bound
#define all(x) (x).begin(), (x).end()

using namespace std;
int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    int n;
    cin>>n;
    map<int,int> mapa;
    for(int i=0;i<n;i++) {
        int tmp; cin>>tmp;
        mapa[tmp]++;
    }
    vector<pair<int,int>> A;
    for(auto [a, b]: mapa) 
        A.push_back({b, a});
    
    sort(A.rbegin(), A.rend());

    int sum = 0;

    for(int i=1;i<=A.size();i++) {
        sum += (A[i-1].st - 1) * 2 + 1;
        if(sum >= n) {
            cout<<i;
            return 0;
        }
    }
    cout<<n;
    return 0;
}