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#include <iostream>
#include <algorithm>

using namespace std;
int n, t[500007] = {}, t2[500007] = {}, score=0, it=0;
int main(){
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>t[i];
        t2[t[i]]--;
    }
    sort(t2, t2+n+1);
    while(n>0){
        n += t2[it]*2;
        n++;
        score++;
        it++;
    }
    cout<<score<<"\n";
    return 0;
}