If you are not so mathematically inclined....
1. Run the audit log on the computer where the AC database is located. (As described elsewhere by Sandeep, this may involve running the database optimizer first).
2. Click on the column in the audit log "PatientID" to sort by number. The highest number will come to the top. The description should be "Created new patient".
That's your number.
You may have to reset the dates on the log if you have not created a new patient in the past 24 hours (the default is for a one day log).
