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

int a[1010];
int main(){
	int N;
	cin >> N;
	for(int i = 0 ; i < N ; i++) cin >> a[i];
	sort(a,a+N);
	if( N % 2 ) cout << a[N/2] << endl;
	else cout << (a[N/2]+a[N/2-1])/2. << endl;
}