#include<bits/stdc++.h>

using namespace std;
typedef long long ll;


int main(){
   int N; cin >> N;
   vector<int> A(N);
    for(int i=0; i<N; i++) cin >> A.at(i);
    sort(A.begin(), A.end());
    if(N%2==0) cout << (double)(A.at(N/2-1) + A.at(N/2))/2 << endl;
    else cout << (double)A.at(N/2-1) << endl;
}