#include<bits/stdc++.h>
using namespace std;
int main(){
    int n;
    cin >> n;
    double a[n];
    for(int i=0; i<n; i++) cin >> a[i];
    sort(a,a+n);
    if(n%2==0) cout << (a[(n-1)/2]+a[(n+1)/2])/2 << endl;
    else cout << a[(n+1)/2-1] << endl;
}