#!/usr/bin/env bash
set -u
set -o pipefail
export LC_ALL=C
count="08"
[[ $count =~ ^[0-9]{1,3}$ ]] || exit 2
value=$((10#$count))
total=$((value * 3))
[[ $total -eq 24 ]] || exit 1
printf "Three batches: %d sheets\n" "$total"