#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main() {
    int n;cin>>n;
    vector<int> v(n);

    for(int i=0;i<n;i++){
        cin>>v[i];
    }
    sort(v.begin(),v.end());
    if (v.size() % 2 == 1) {
        cout<<v[v.size()/2];
    } else {
        cout<<(double)(v[v.size()/2] + v[v.size()/2-1])/2;
    }

}