Uses/Submissions per month

We are a not for profit organization taht is updating it's membership list profile with an on-line form from Jotform.  There will be approximately 275 members who will complete the form.  Once completed there will only be uses every once in awhile as new people join.  What happens if we go over the 100 per month entries and I have not registered for more?  I don't know how many people will be using it on the 1st posting.

When your account surpasses the limits, your forms will be temporary disabled. Your users will not be able to view the form except this message.

While you are near your limits, JotForm will send you a notification over email indicating that your forms will be scheduled to be disabled on the specified dates. Upgrading immediately to any of the paid plans will prevent this from happening. But, if you do not wish to upgrade you have to wait until the monthly submissions reset period comes which will be every first day of the following month. Example, next reset would be on July 01, 2016.

If you have further quesitons, please let us know.

Thank you!