n, m = read_line.split.map(&.to_i)
a = read_line.split.map(&.to_i)
open = Array.new(n + 1, 0)
a.each do |i|
  open[i] = 1
end
ans = 0
n.downto(1) do |i|
  if open[i] == 0
    ans += 1
  else
    d = 1
    while d * d < i
      if i % d == 0
        open[i // d] ^= 1
        open[d] ^= 1
      end
      d += 1
    end
    if d * d == i
      open[d] ^= 1
    end
  end
end
puts ans