It is very important to count the number of divs.

Hello. 

I kindly ask for help in solving my task.

There is a field called field_items, which displays items (field_item) with allowed values ranging from one to four.  I need to count how many items are displayed and assign a specific width (width) to their divs with the class field_item based on their quantity.

I hope for your assistance! Thank you in advance!