I'm a duck and I have 16 fish. On the first day my friend Jeffery comes along and takes 4 fish in exchange for 8, then Susan comes and takes 13. The next day I catch 3 fish and steal four fish. The day after than I'm given a fish by Jenna and Harry gives me six. Two days later, I am able to take the amount of fish Susan took from me. How many fish do I have on the fourth day?
