def main():
    n = input()
    list = input().split(" ")
    list = [int(i) for i in list]
    list.sort()
    if len(list) % 2 == 0:
        median = (list[int(len(list) / 2)] + list[int(len(list) / 2 - 1)]) / 2
    else:
        median = list[int(len(list) / 2)]

    print(median)


if __name__ == "__main__":
    main()