Tractor Jack is a notorious pirate captain who sails the Saskatchewan River plundering farms for

wheat, barley, and all the other grains. You may remember him from his exploits in CMPT $141$ or

CMPT $214.$ Jack wants to simulate the loading of cargo onto his ships so he can track how much of

one type of grain is on a given ship, and to make sure that his ships are not overloaded