n = int(input())
a = list(map(int,input().split()))
a_sort = sorted(a)

if len(a) % 2 != 0:
    print(a_sort[len(a) // 2])
else:
    print( (a_sort[len(a) // 2 - 1] + a_sort[len(a) // 2]) /2 )