import sys

def check(x):
	if x < 1 or x > 1000:
		raise
		sys.exit()

N = int(input())
check(N)

list = input().split(' ')
buf = len(list)

if buf != N:
	raise
	sys.exit()

buf = buf // 2
list.sort()

if buf % 2 == 0:
	buf = int(list[buf]) + int(list[buf-1])
	buf /= 2
else:
	buf = int(list[buf])

print(buf)