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#include<bits/stdc++.h>
using namespace std;

int n,x;
int counters[500003];
int main()
{
	ios_base::sync_with_stdio(0);
	cin>>n;
	for(int i=0;i<n;i++)
	{
		cin>>x;
		counters[x]++;
	}
	sort(counters, counters+n+1,greater<int>());
	x=n;
	int i;
	for(i=0;x>0;i++)
	{
		x-=counters[i]*2-1;
	}
	cout<<i;
	return 0;
}