I want to make a layered cylinder in solidworks. I am showing an example if figure below. Here I have 5 layers and I drew the circles and extruded alternative layers. then in next operation I extruded the rest of the layers.

In my actual case there are around 50 layers and 8 such disks of different sizes so I need a method to do it easily. is there any way to pattern this or use some equations to do this operation easily?