//neko.cpp
#include<iostream>
#include<string>
#include<math.h>
using namespace std;

int main() 
{
	int n;
	cin >> n;
	float a[1000];
	float kara[1];
	for (int i = 0; i <= n - 1; i++) {
		cin >> a[i];
	}
	for (int j = 0; j <= n - 1; j++) {
		for (int k = j; k <= n - 1; k++) {
			if (a[j] > a[k]) {
				kara[0] = a[j];
				a[j] = a[k];
				a[k] = kara[0];
			}
		}
	}
	if (n % 2 == 1) {
		cout << a[n / 2];
	}
	else if (n % 2 == 0) {
	
		cout << (a[n / 2 - 1] + a[n / 2]) / 2;
		
	}

}