#!bin/bash

if [ $# -ne 6 ]; then
	echo "Please provide 6 arguments"
	exit 1
fi

total=0
count=0

marks=("$@")
# Expands the list of arguments to be space seperated, then splits the output
# on a space with a newline. The list is then sorted in descending order.
# This allows the iteration through the list until count = length=1, removing
# the last value from the calculation.
marks=($(echo "${marks[@]}" | tr ' ' '\n' | sort -nr))

while [ "$count" -lt 5 ]; do
	total=$((total + marks[count]))
	count=$((count + 1))
done

avg=$(( ( total + 5 / 2 ) / 5 ))

echo "Average of best five modules: $avg%"