As, I am driving the bus, My eye color is bus driver’s eyes color. Those, who read this passage and their eye color is bus driver’s eye color. 😉

As of now, I am just considering cutting the cake as same as cutting the circle.

For 1 – max 2
2 – max 4
3 – max 7
4 – max 11
5 – max 16

So, we will get 11 maximum pieces for 4 vertical cut.

There will be no dirt inside the hole. However the dirt will be present beside the hole ~ 1018 cu.in.