Increasing-decreasing number [UE- 5]

Hey, im new in unreal engine coding, and im struggling with some issue. I need some loop that allows variable to increase until certain number, and then decrease again on 0 - infinitely.

I need to increase number from 0 to 90, and then decrease from 90 to 0, infinitely.
Oh, and also, if anyone knows, I would like to do this with some delay to do it little bit slower.

Thanks for your answers!