The current price of a stock is $$35,$ and the annual risk$-$free rate is $3\%.$ A call option with a strike price of $$31$ and with $1$ year until expiration has a current value of $$6\mathrm{.}60.$ What is the value of a put option written on the stock with the same exercise price and expiration date as the call option? Do not round intermediate calculations. Round your answer to the nearest cent.