Where are these data points (in a text box, a list box?),
How are they set, and what is the relationship to the check boxes. are there two checks boxes per data point?
Where is this "1" going to be.
Since the "1" value depends on two different inputs, a calculation script is a good place to put the code, because calculation scripts are run each time any field changes. So here's an example of a calculation script.
if((this.getField("check1").value == "Yes") || (this.getField("check2").value == "Yes"))
event.value = 1;
else
{ display the thing that gets displayed when it's not "1"}
Here's an old tutorial on setting up calculations:
https://acrobatusers.com/tutorials/how-to-do-not-so-simple-form-calculations
Here's lots more recent info:
Calculating field values and more