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#include<bits/stdc++.h>

using namespace std;

vector<int> ile, tab;
vector<vector<int>> kub;
int n;

int main(){
	ios_base::sync_with_stdio(0);cout.tie(0);cin.tie(0);
	
    cin>>n;
    ile.assign(n + 1, 0);
    kub.assign(n + 1, vector<int>());

    for(int i = 0, v; i < n; ++i){
        cin>>v;
        ile[v]++;
    }

    for(int i = 1; i <= n; ++i){
        kub[ile[i]].push_back(i);
    }

    for(int i = 1; i <= n; ++i){
        for(int v : kub[i])
            tab.push_back(v);
    }


    int left = n;
    int result = 0;
    while(left > 0){
        result++;
        left -= ile[tab.back()] * 2 - 1;
        tab.pop_back();
    }

    cout<<result<<endl;

	return 0;
}