#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main(){
    int n;cin >> n;
    vector<int> a(n);
    for(int i = 0; n > i; i++){
        cin>>a[i];
    }
    sort(a.begin(),a.end());
    if(n%2==0){
        cout << (float)(a[n/2]+a[n/2-1])/2 << endl;
    }else cout << a[n/2] << endl;
}