On the Subject of Christmas Presents

the "white album" season

it’s christmas, open presents, click clock at correct time.

otherwise, have a strike.

There are 13 gifts in total.

Marge	Simon	Bob	May	Bertie

1. Count # presents from each person.
2. X = abs( #Marge + #Simon - #Bob ) + #indicators
3. Y = max { abs( #May - #Bertie ), 1 } + #ports
4. Z = (X × Y + #batteries) % 14 + 7
5. Click module timer when hour time = Z

Notations used:

• #: number of
• abs(X): If X is negative, multiply by -1
• max{ X,Y }: Take value X or Y, whichever is larger
• %: Modular arithmetic, aka mod