Minimum number of public IP addresses with load balancer

Hi,

I set up a load balancer for my EC2 instance in order to use an SSL cert with the site that is running on the instance. I naively associated all three subnets in my VPC with the load balancer. I noticed in the IP address manager that I now have four public IP addresses (which are being charged for).

Is it possible to set up a load balancer so that there is only one public IP address? The site is low traffic - I only set up the LB as it seemed to be the easiest way to get https connectivity working.

Thanks for your help.