#include <iostream>

using namespace std;

int main() {
    int N, tmp;
    cin >> N;
    int A[N];
    for(int i = 0; i < N; i++){
        cin >> A[i];
    }
    for(int i = 0; i < N; i++){
        for(int j = i + 1; j < N; j++){
            if(A[i] > A[j]){
                tmp = A[i];
                A[i] = A[j];
                A[j] = tmp;
            }
        }
    }
    if(N % 2 == 0){
        cout << (double) (A[N/2-1] + A[N/2]) / 2 << endl;
    }else{
        cout << A[N-1/2] << endl;
    }
    return 0;
}