N = gets.to_i
L = gets.split.map(&:to_i)
K = gets.to_i
ans = (1..(50)).inject([0.0, L.max]) {|(i, s), _|
  c = (s + i) / 2
  if L.map {|l| (l / c).floor}.inject(:+) >= K
    [c, s]
  else
    [i, c]
  end
}[0]
puts ans