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

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