-- yukicoder My Practice
-- author: Leonardone @ NEETSDKASU

n = io.read()

t = {}
i = 1
for c in io.read():gmatch('%S+') do
	t[i] = tonumber(c)
	i = i + 1
end

table.sort(t)

if n % 2 == 0 then
	x = n / 2
	print((t[x] + t[x + 1]) / 2)
else
	x = math.ceil(n / 2)
	print(t[x])
end