Need to create conditional calculation script that will add the results if greater than or equal 3

I am creating a form where someone will respond to 75 statements (with each being a different field) on a likert scale of 0 to 4.  I can figure out how to create a calculation of the sum of all the fields but I also need to create a conditional calculation script that will look at the value for each statement and if the value is greater than or equal to 3 it adds the value into the total.  If it is 2 or less, then it can be left out of the calculation.

so it might look like:

Question1 = 3

Question2 = 2

Question3 = 4

Question4 = 1

Question5 = 3

Question6 = 3

Question7 = 2

Question8 = 4

Question9 = 3

Question10 = 2

So ideally, the script would be able to recognize that Question2, Question3, Question5, Question6, Question8, and Question9 would be added together into a total.  so 3+4+3+3+4+3 = 20

Any help would be greatly appreciated

thanks