Google sheets random number generation help

I'm trying to generate random numbers in an interval, x number of times.Imagine rpg dice sintax, like:3d6 means roll 3 times a dice of 6 sides. Or 5d100 means roll 5 dices of 100 sides.If I was to generate one x-sided dice y times, how can I do this?.

In this case, on B4, I used:

IF(B3 = TRUE;RANDBETWEEN(1;4))

But this only generate one d4.I want to generate b2 number of d4's, but dont know how!Can someone help me? please and thanks!