Doing A Math Problem With ASP

I want to enter a math formula to caculate how many pages are there for each thread.

At this point, I set the page break to 15 posts for each thread. In other words, one page contains 15 replies to one thread. If there are more than 15 and less than 30 replies, then page number is equal to 2. If more than 30, the page number is equal to 3.

If I translate this to a math formula, it would be like

total replies divided by 15 = the number of page (this number should round up like 0.x=1)
if total replies is 3, so 3 divided by 15 = 0.2 (round it up to 1)
if total replies is 18, so 18 divided by 15 = 1.2 (round it up to 2)

How can I do this?

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