How do I write JavaScript for a complex calculation in a PDF?

Is there a way to create a more complex calculation in a PDF? I have created an order form that has separate fields for quantity, price and subtotals. For every item on the order form, the first two quantities are no charge. Each quantity after that is .25/each. How do I write the JavaScript to accomplish this calculation?
e.g. 6 items ordered, first 2 are No Charge,
=(2*0.00)+(Qty-2*0.25), should equal $1.00
=(2*0.00)+(6-2*0.25)
=0.00+1.00
=1.00

Not quite. You still need to use the eval function otherwise the numbers are just strings.
Try this in the JavaScript Debugger:
var Qty = 4;
if (Qty>2) {
var subtotal = eval ((Qty-2)*0.25);
} else {
var subtotal = 0;
app.alert (subtotal);
Steve

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