Imprudential, Incorporated, has an unfunded pension liability of $577 million that must be paid in 15 years. To assess the value of the firm's stock. financial analysts want to discount this liability back to the present. If the relevant discount rate is 7 percent, what is the present value of this liability? (Do not round intermediate calculations and enter your answer in dollars, not millions, rounded to 2 decimal places, e.g.. 1,234,567.89)