def fibonacci(index)
	arr = [0, 1]
	while arr.length < index
	if arr.length > 3		# I'll be damned if arr[3] is going to spoil my quick code >:O
		arr[3] = 2
	end
	num1 = arr.index(arr.last)
	num2 = arr.index(arr.last)-1
	next_value = arr[num1]+arr[num2]
	arr << next_value
  	end
p arr[index-1]
end