#include <iostream>
using namespace std;
int main() {
	int n, a[1000];
	float median;
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	for (int i = 0; i < n - 1; i++) {
		for (int j = i + 1; j < n; j++) {
			if (a[i] < a[j]) {
				int swap = a[j];
				a[j] = a[i];
				a[i] = swap;
			}
		}
	}
	int middle=n/2;
	if (n % 2 == 1) {
		median = a[middle];
	}
	else {
		median = (float)(a[middle] + a[middle - 1]) / 2;
	}
	cout << median << endl;

	return 0;
}