#include<iostream>
#include<vector>
#include<algorithm>
#include<iomanip>

using namespace std;

int main(){
    cout << setprecision(1) << fixed;
    int N, t;
    cin >> N;
    vector<float> A;
    for(int i = 0; i < N; i++){
        cin >> t;
        A.push_back(t);
    }

    sort(A.begin(), A.end());

    if(N % 2 == 0){
        cout << (A[N/2-1] + A[N/2])/2 << endl;
    }else{
        cout << A[(N-1)/2] << endl;
    }

    return 0;
}