amazon web services - elastic ip addresses and cost

I always understood that you can have one ip for free, then you start paying for it. Also, it has to be associated.

But i need another one for my mailserver, and after reading their documentation word for word, i read it as, per instance.

Is that true? Can i have up to 5 elastic addresses for free as long as they are associated to my instances?

You can have one Elastic IP (EIP) address associated with a running instance at no charge. If you associate additional EIPs with that instance, you will be charged for each additional EIP associated with that instance per hour on a pro rata basis. Additional EIPs are only available in Amazon VPC.