#include <bits/stdc++.h>
using namespace std;
int main(){
    
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    int n;
    cin >> n;
    
    vector<int> vc(n);
    for(auto &i : vc){
        cin >> i;
    }
    
    sort(vc.begin(),vc.end());
    
    int sum =  (n-1) / 2.0;
    
    cout << ( n % 2 == 0 ? ( vc[sum] + vc[sum + 1] )/ 2.0 : vc[sum] ) << endl;
    
    return 0;
}