You've just been hired at Lighthouse Markets, a reputable (and thoroughly fictional) grocery store chain. One of the primary features of Lighthouse Markets is their recycling program on pop bottles. Here is how the program works:
- For every two empty bottles, you can get one free (full) bottle of pop
- For every four bottle caps, you can get one free (full) bottle of pop
- Each bottle of pop costs $2 to purchase
Given these parameters, write a program so that you can figure out how many total bottles of pop can be redeemed given a customer investment.