Approval workflows

Hi, I would like to setup the following in the approval workflow options, but cannot seem to figure this out.

We have 5 users, all 5 users can create journals, but only 3 of those users can approve the journals. So the users creating the journals can also approve journals, but not their own.

Example: User 1 creates the journal, either user 2 or 3 must approve, or user 2 creates the journal, either user 1 or 3 can approve etc. If user 4 or 5 create the journal, then either user 1, 2, or 3 can approve.

Can the workflow be setup this way? If not, do any of you know of a modification that accommodates this scenario?

Thanks in advance for your help and assistance.