#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <iomanip>
#include <cmath>
#include <functional>
using namespace std;
#define diff(x,y) ((x > y) ? (x - y) : (y - x))
#define us(x) (x > 0) ? x : x * -1
#define lli long long int

int main() {
	int n;
	cin >> n;
	vector <int> num(n, 0);
	for (int i = 0; i < n; i++)
		cin >> num[i];
	sort(num.begin(), num.end());
	if (n % 2)
		cout << num[n / 2] << endl;
	else
		cout << (num[n / 2 - 1] + num[n / 2]) / 2.0 << endl;
	return 0;
}