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#include <bits/stdc++.h>
using namespace std;
array<int,500001> a;
long long n,m,i,j;
int main(){
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	cin >> n;
	for (i=0;i<n;i++){
		cin >> m;
		a[m]++;
	}
	make_heap(a.begin(),a.end());
	sort_heap(a.begin(),a.end());
	j=500000;
	i=0;
	while (n>0){
		if (a[j]){
			i++;
			n-=2*a[j]-1;
		}
		j--;
	}
	cout << i << '\n';
}