F is employed by a public corporation. In year $1,$ F was granted a stock option to acquire $3,000$ shares from the treasury of her employer's corporation for $$10$ a share. At the time of receiving the option, the shares were valued at $$12$ per share. In year $4,F$ exercised her option and purchased $3,000$ shares for $$30,000.$ At the purchase date, the shares were valued at $$13$ per share. In yea $6,$ F sold $3,000$ shares for $$18$ per share. What amount is included in F$\text{'}$s overall net income for tax purposes in year $6?$