A student wants to design and implement a Python program to keep track of the largest single payment they have made from their bank account in a week. The amounts of money, in pennies, paid into their account $($the credits$)$ are represented by positive integers and the amounts of money, in pennies, paid out of their account $($the debits$)$ are represented as negative integers. There are many ways of doing this, but here is their initial top$-$level decomposition.