Hi, I want to make my big total field add increase by 2,000 every time someone selects at least 2 (not 1) items in the checkbox. Here is the logic: I have a total field that shows an amount, And I have a checkbox field with over 20 items. So, I want it such that anytime someone selects 1 item, 0 is added to the total. But when you select 2 items, 2000 is added to the total. And when 3 items are selected, 4000 is added to the total, and when 4 items are selected, 6000 is added to the total and so on. More like getting 1 free addon (by selecting 1 checkbox and paying 2000 if you select an additional box. And every new checkbox you select, attracts another 2,000 each). So, how do I make selecting just 1 checkbox not add anything to the total, but adding another box will add 2000 to the total and so on in this progression?