import sys

def check_N(x):
	if x < 1 or x > 1000:
		sys.exit()
	else:
		return

def check_x(x):
	if x < -1000 or x > 1000:
		sys.exit()
	else:
		return

N = int(input())
check_N(N)

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

for i in range(0,buf):
	list[i] = int(list[i])
	check_x(list[i])

if buf != N:
	sys.exit()

list.sort()

if N % 2 == 0:

	i = N // 2
	buf = int(list[i]) + int(list[i-1])
	buf /= 2
else:
	i = N // 2
	buf = int(list[i])

print(buf)