#include <iostream>
#include <vector>
#include <algorithm>
#define P(x) cout <<x<<endl
using namespace std;

int main(){
    int n,ans;
    cin >> n;
    vector<int> a(n);
    for(int i=0;i<n;i++){
        cin >> a[i];
    }
    sort(a.begin(),a.end());
    int num = a.size();
    if(num%2 ==1){
        P(a[(num-1)/2]);
    }else{
        P((float)(a[num/2]+a[num/2-1])/2  );
    }
}