#include <bits/stdc++.h>
using namespace std;

int main () {

    int N;

    cin >> N;

    int A[N];

    for (int i = 0; i < N; i++) {
        cin >> A[i];
    }

    sort(A, A + N);

    if (N % 2 == 1) {
        cout << A[(N-1)/2] << endl;
    }
    else {
        cout << (double)(A[(N-1)/2] + A[N/2]) / 2 << endl;
    }

    return 0;
}