How do I random of some values

Hello guys i want to create a random value but for some specific values.

for example start at 30 and add 60 so the values should be random of 30, 90, 150, 210, 270, 330, 390 and 450.

Thanks for all

int(random(8)) * 60 + 30

Wow, now i feel im dumb person xD.

Thanks a lot blackhornet.