You run a construction firm. You have just won a contract to build a government office building. Building it requires an investment of $10.4 million today, and $5.0 million in one year. The government will pay you $24.0 million in one year upon the building's completion. Suppose the cash flows and their times of payment are certain, and the risk-free interest rate is 9%. The NPV of this opportunity is $__________ million. (Round to two decimal places.)