import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int size = sc.nextInt();
        int[] num = new int[size];
        int i, j, temp, m;

        for (i = 0; i < size; i++) //read
            num[i] = sc.nextInt();
        //sort desc
        for (i = 1; i < size; i++) {
            temp = num[i];
            for (j = i-1; j >= 0 && temp < num[j]; j--)
                num[j+1] = num[j];
            num[j+1] = temp;
        }
        m = (int)(size/2+0.99999); //chuo
        if (size % 2 == 0) {
            i = m-1;
            System.out.printf("%.1f\n", (double)(num[m]+num[i])/2);
            return;
        }
        System.out.printf("%d\n", num[m]);
    }
}