#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <math.h>
using namespace std;

int main() {
    int n,x;
    cin >> n;
    vector<double>a;
    for(int i = 0;i < n;i++){
        cin >> x;
        a.push_back(x);
    }
    sort(a.begin(),a.end());
    
    if(n%2 == 1){
        cout << a[n/2];
    }else{
        cout << (a[n/2] + a[n/2-1])/2;
    }
    return 0;
}