#include <bits/stdc++.h>
using namespace std;
#define REP(i, n)           for(int(i)=0;(i)<(n);++(i))
int a[1111];
int main(){
    int N; cin >> N;
    REP(i,N) cin >> a[i];
    sort(a,a+N);
    cout << (N%2 ? a[N/2] : (a[N/2]+a[N/2-1])/2.) << endl;
}