local N = io.read("*n")
local A = {}
for i=1, N do
  A[i] = io.read("*n")
end
table.sort(A)
if #A % 2 == 0 then
  print((A[N / 2] + A[N / 2 + 1]) / 2)
else
  print(A[math.ceil(N / 2)])
end