#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#include <algorithm>

using namespace std;

int main()
{
    int answer;
    int n;
    scanf("%d", &n);

    int array[n];

    for (int i = 0; i < n; i++)
    {
        int a;
        scanf("%d", &a);
        array[i] = a;
    }

    sort(array, array + sizeof(array) / sizeof(array[0]));

    if (n % 2 == 0)
    {
        int index1 = n / 2 - 1;
        int index2 = index1 + 1;
        printf("%.1f\n", (array[index1] + array[index2]) / 2.0);
    }
    else
    {
        printf("%d\n", array[n / 2]);
    }
}