#include <bits/stdc++.h>

using namespace std;

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

	return 0;
}