N=gets.chomp.to_i
L=gets.chomp.split.map {|x| x.to_i}

def median(numbers)
  numbers.sort!
  if numbers.length % 2 == 1
    return numbers[(numbers.length / 2).to_i - 1 + 1]
  else
    return (numbers[(numbers.length / 2).to_i - 1] + numbers[(numbers.length / 2).to_i + - 1 + 1]).to_f / 2
  end
end

puts median(L)