#include <iostream>
#include <cstdio>
#include <cmath>
#include <algorithm>
using namespace std;

int main() {
	int N;
	cin>>N;
	int A[N];
	for(int i=0;i<N;i++){
		cin>>A[i];
	}
	sort(A,A+N);
	if(N%2)	cout<<A[(N-1)/2];
	else	cout<<(A[N/2-1]+A[N/2])/2.0;
	return 0;
}