Until now you didn't have any way to define your own types or store information about state in a readable way. The most simple construct to do that are enums. Enums are enumeration types, meaning they are basicly ints but they allow you to use a name instead of numbers. The compiler will then translate those names in numbers.

This is usefull, because you see at a glance, what you want to say with your code, instead of trying to find out, what a 4 means in this case. Also if you want to change anything about your enum, you only have to change it in the definition, except you change the names.

Write a function, which returns the number of days to the specified one.