The closest we can get to this scenario is:
$5 for domestic shipping for first item and $1 for each subsequent item $12 for international shipping for first item and $2.40 for each subsequent item
If that's acceptable, please go to E-junkie seller admin > Shipping settings. Enter 1 in domestic price per ounce and 2.40 in international price per ounce. Set the weight of small box to 1 and price to 0.
Then, in your product settings, set the weight to 1, container to "small box", packaging capacity to 10000 (any high number).