E

#define _CRT_SECURE_NO_DEPRECATE

#include <iostream>
#include <vector>
#include <string>
#include <map>
#include <stack>
#include <algorithm>

using namespace std;

int a[5001];

int main() {

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