want to ignore some points for input

Hello guys, 

Now I have a control to a port, the range will be from 0 to 360. However, I want to ignore some points. If the value is from 0 to 1, output 1. If from 89 to 90, output 89. If from 90 to 91 output 91. If from 179 to 180, output 179. Just like this way, also do points near 270 and 360.

So basically, it require the value near certain points coerced to a value.

Anyway to solve this？

Thanks