Puzzle #23: how many cakes should you carry to get to the beach with 2 cakes?

There are 7 unicorns between your house and the beach.

Every time you bring a cake from your house to the beach each unicorn asks you to leave there half of the cakes you carry.

Since they are nice unicorns, each of them give your back a cake.

How many cakes do you need to carry to get to the beach with 2 cakes?

How many cakes should you carry to get to the beach with 2 cakes?

Have fun!