[maxmsp] Random between +/- 128.0??

Hi,

I think maybe I didn't sleep very well these days so when I need to create a random number between +128.0 and -128.0, my brain suddenly stopped and feels like empty.....

I know "random" can only make 0+ numbers. I also think of the possibilities by put "-" after random to make the number below 0....however, I still want to make "real" random number between +/-128.0 and it is must be float number, so the result will be something like "9.5, -4.8, 25.4, 46.7, 53.6, -42,1...."

If you know how to do it, would you please pleas tell me? 

thanks