number_of_data = int(input())
a = list(map(int,input().split()))
a = sorted(a)
if number_of_data % 2 ==1:
    print(a[int((number_of_data-1)/2 )])
else:
    print((a[int(number_of_data/2 - 1)]+a[int(number_of_data/2)])/2)