How do I write a script that, when the user runs it, it will give a sum of the total of the command line arguments that are numbers?

Lets say the script name is "Command"

When the user types Command 10 20 30...they should see an output of 60.

I think it should be something like this:


for Command $1 $2 $3 $4 $5
do
((total = total + $3)) ### to keep a running total
echo $total
done



This is purely a guess. It does not work like this but I do get some output without error messages, so I think I may be on the right track.

When I try other options like creating arguments for "num" or "sum" it goes badly.

Any help would be appreciated.

Thanks