You are offered an investment that will make four payments. The first payment is $$500$ and will occur two years from today. The second payment is $$600$ and will occur three years from today. The third payment is $$700$ and will occur four years from today. The last payment will occur six years from today and the payment amount is $$1000.$ You can earn $9$ percent on very similar investments. What is the most you should pay for this one?