#include <bits/stdc++.h>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;

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==1) cout << a[(n-1)/2] << endl;
	else cout << (a[n/2-1]+a[n/2])/2.0 << endl;
	return 0;
}