Dependent care carryover used in 2019

What should I enter for dependent care questionnaire that asks "Enter the amount of any excess contributions that you carried over from 2018 that you used to pay qualified expenses during the grace period in 2019."

 

My company plan year is from 7/1 to 6/30 having said that during the plan year of 7/1/2018 to 6/30/2019 I had elected for $5000 of child DFSA, though I was contributing from 7/1/2018, I ended up claiming all of that b/w 2/1/2019 to 6/30/2019. Having said that b/w 7/1/2018 to 12/31/2018 I had contributed $2400 which I used it up in 2019, as it was valid per my company plan year. So for the above question should I be entering $2400 or 0 is my question.