//275 median

/*
median
array -> sort -> average between 2 number in array's central
*/

import java.util.Scanner;

class Median {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int[] arrayInt = new int[n];
        //順番に配列に挿入
        for(int i = 0; i < arrayInt.length; i++) {
            arrayInt[i] = in.nextInt();
        }
        //数の大きい順にソート
        for(int i = 0; i < arrayInt.length - 1; i++) {
            for(int j = arrayInt.length - 1; j > i; j--) {
                if(arrayInt[j] < arrayInt[j - 1]) {
                    int t = arrayInt[j];
                    arrayInt[j] = arrayInt[j - 1];
                    arrayInt[j - 1] = t;
                }
            }
        }
        if(n % 2 == 1) {
            int b = (n + 1) / 2;
            System.out.println(arrayInt[b - 1]);
        } else {
            double b = ((n + 1.0) / 2.0);
            int c = (int)((b - 0.5) - 1);
            int d = (int)((b + 0.5) - 1);
            double e = (arrayInt[c] + arrayInt[d]) / 2.0;
            System.out.println(e);
        }
    }
}