defmodule Fib do def fib when 30 do parent self spawn fn send parent f

defmodule Fib do
	def fib(n) when n > 30 do
		parent = self()
		spawn fn -> send parent, fib(n - 1) end
		a = fib(n - 2)
		receive	do
			x -> a + x
		end
	end
	
	def fib(n) when n > 1, do: fib(n - 1) + fib(n - 2)
	def fib(1), do: 1
	def fib(0), do: 0
end


IO.puts Fib.fib(42)