import java.util.Scanner;

public class No_275 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		float[] F = new float[sc.nextInt()];

		for (int i = 0; i < F.length; i++) {
			F[i] = sc.nextInt();
		}

		for (int i = 0; i < F.length - 1; i++) {
			for (int j = i + 1; j < F.length; j++) {
				if (F[i] > F[j]) {
					float tmp = F[i];
					F[i] = F[j];
					F[j] = tmp;
				}
			}
		}

		System.out.println(lookForMedian(F));
		sc.close();
	}

	static float lookForMedian(float[] m) {
		int ml = m.length % 2;
		if (ml == 0) {
			return (m[m.length / 2 - 1] + m[m.length / 2]) / 2;
		} else {
			return m[m.length / 2];
		}
	}
}