  Research in secure multi-party computation using a deck of playing cards,
often called card-based cryptography, dates back to 1989 when Den Boer
introduced the "five-card trick" to compute the logical AND function. Since
then, many protocols to compute different functions have been developed. In
this paper, we propose a new encoding scheme that uses five cards to encode
each integer in $\mathbb{Z}/6\mathbb{Z}$. Using this encoding scheme, we
develop protocols that can copy a commitment with 13 cards, add two integers
with 10 cards, and multiply two integers with 14 cards. All of our protocols
are the currently best known protocols in terms of the required number of
cards. Our encoding scheme can be generalized to encode integers in
$\mathbb{Z}/n\mathbb{Z}$ for other values of $n$ as well.
