Random integer that is a multiple of 5

This is likely a simple question, but i could not find an answer any-which-way i searched for it.

Im wondering how i can set a field to be an integer that is between say 1-100, but also is a multiple of 5.

Im sure this is possible with the f(x) options but an unsure of how to accomplish it

I answered my own question. for anyone else, its pretty close to raw JS.

round(5*(this/5))