\documentclass[11pt]{scrartcl}
\usepackage{evan}
\begin{document}
\title{Cono Sur 2020/6}
\subtitle{Evan Chen}
\author{Twitch Solves ISL}
\date{Episode 42}
\maketitle
\section*{Problem}
A $4$ x $4$ square board is called \emph{brasuca}
if it follows all the conditions:
\begin{itemize}
\ii each box contains one of the numbers $0, 1, 2, 3, 4$ or $5$;
\ii the sum of the numbers in each line is $5$;
\ii the sum of the numbers in each column is $5$;
\ii the sum of the numbers on each diagonal of four squares is $5$;
\ii the number written in the upper left box of the board
is less than or equal to the other numbers the board;
\ii when dividing the board into four $2 \times 2$ squares,
in each of them the sum of the four numbers and 5.
\end{itemize}
How many brasucas boards are there?
\section*{Video}
\href{https://www.youtube.com/watch?v=iQkSQ97KWCA&list=PLi6h8GM1FA6yHh4gDk_ZYezmncU1EJUmZ}{\texttt{https://youtu.be/iQkSQ97KWCA}}
\newpage
\section*{Solution}
TO BE WRITTEN
\end{document}