N = int(input())
Arry_in = input().split()
Arry_in.sort()

cen_N = int(N / 2)

if N % 2 == 0:
	print((int(Arry_in[cen_N - 1]) + int(Arry_in[cen_N])) / 2)
else:
	print(Arry_in[cen_N])