Checklist save to Firebase [closed]

I’m trying to create a checklist with fruits and the number of calories. Add up the total calories of the marked fruits.
Example:

Yes: 1 fruit = 10 calories
Yes: fruit 2 = 20 calories
No:  fruit 3 = 30 calories 
Total calories = 30 calories. 

The same list will appear for each user, but the checkboxes will be marked individually and stored in Firebase. In the end, I would like to rank the users with the highest amount of calories.

 Example: 
    1st Lady = 60 calories 
    2nd michael = 50 calories 
    3rd Katy = 30 calories.....

create a calorie calculator with ranking, using firebase