echo "Enter a number:"
read no
i=1
ans=0
while [ $i -le `expr $no / 2` ]
	do	
		if [ `expr $no % $i` -eq 0 ]
		then 
			ans=`expr $ans + $i`
		fi
		i=`expr $i + 1`
done
if [ $no -eq $ans ]
then
echo "$no is a perfect number"
else
echo "$no is not a perfect number"
fi