read l
read n
read -a w
b=($(printf "%s\n" "${w[@]}" | sort -n))
s=0
i=0
while [ $i -ne $n -a $l -ge $s ]
do
	s=$((s+b[$i]))
	if [ $l -ge $s ] ; then
		i=$((i+1))
	fi
done
echo $i