#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define Would
#define you
#define please

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	int N;
	cin >> N;
	int A[1000];
	rep(i, N) cin >> A[i];
	sort(A, A + N);

	if (N % 2) {
		co(A[N / 2]);
	}
	else {
		double kotae = 0.5 * (A[N / 2] + A[N / 2 - 1]);
		co(kotae);
	}


	Would you please return 0;
}