n, m = gets.split.map(&:to_i)
box = gets.split.map(&:to_i)
count = 0
empty_box = 0
while m > count
  if box.min > 0
    box[box.index(box.min)] -= 1
    count += 1
    if box.min == 0
      box.delete_at(box.index(box.min))
      empty_box += 1
    end
    break if count == m
  end
end
puts empty_box