Putting a count on a field in Forms

Putting a count on a field in Forms

Hi, 

I'm trying to put a count on a Form so that when that choice has been selected a certain number of times it is no longer available. For example, let's say I have a volunteer day sign up form but there are specific roles people choose and only need a certain number of each role.

Like:
            -Wednesday 3 yard debris haulers, 2 Garden bed planters and 1 floater. 
            -Thursday we have 1 Yard Debris Hauler, 1 Garden bed planter and 2 Clean up Crew positions available. 

I need it to be that as people fill out the forms, once the choice is selected it automatically only allows for the remaining number to be selected and so on. (like inventory).

Can Forms do this without having to create a custom function, or at all?