Only the Largest number from a field in the details section

I have one field that contains numbers dictating the number of entries in an assignment i.e. A call can be assigned to one person at a time, and once a call has been dealt with by a person they can close it or resign it to someone else......every time a call is assigned it gets and number. So if it is not assigned, then = 0

Assigned once, then = 1 Assigned twice, then = 2

Assigned three times, then = 3 Etc How can I run a report to only show me the details of the highest number?