postman - how to generate random number in specific range?

i need to generate random number in specific range for postman. i wonder if there is possible to generate it and to use it in veriable in postman, from what i saw at postman site is :

will give random number between 1-1000 and i already tried to do something like these:

to get number between 1-5 but postman didn't get these kind of option, so how to specify range for the random in postman ?