import java.util.Arrays;
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] a = new int[n];
        for(int i = 0; i < n; i++)
        	a[i] = sc.nextInt();
        
        Arrays.sort(a);
        double ans = 0;
        if(n % 2 == 0) {
        	ans = Math.round(((a[n / 2 - 1] + a[n / 2]) * 10) / 2);
        	ans /= 10;
        }
        else ans = Math.round(a[n / 2]);
        
        System.out.println(ans);
    }

}