#include <iostream>
#include <iomanip>
#include <set>
using namespace std;
int main() {
    multiset<int> ms;
    int n;
    cin >> n;
    for (int i = 0; i < n; ++i) {
        int a;
        cin >> a;
        ms.insert(a);
    }
    int j = 0;
    int size = ms.size();
    float ans = 0;
    for (auto iter = ms.cbegin(); iter != ms.cend(); ++iter) {
        if (size % 2 == 0) {
            if (j == size / 2 - 1) ans = *iter;
            if (j == size / 2) ans = (ans + *iter) / 2.0f;
        } else {
            if (j == size / 2) {
                ans = *iter;
                break;
            }
        }
        j++;
    }
    
    cout << fixed << setprecision(1) << ans << endl;
    
    return 0;
}