#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
    int N;
    cin >> N;
    int A[N];
    for(int i = 0; i < N; i++)
    {
        cin >> A[i];
    }
    sort(A, A + N);
    if(N % 2 == 0)
    {
        cout << double(A[N / 2 - 1] + A[N / 2]) / 2 << endl;
    }
    else
    {
        cout << A[N / 2] << endl;
    }
    return 0;
}