F is employed by a public corporation. In year $1,F$ was granted a stock option to acquire $1,000$ shares from the treasury of her employer's corporation for $$8$ a share. At the time of receiving the option, the shares were valued at $$10$ per share. In year $3,F$ exercised the option and purchased $1,000$ shares for $$8,000.$ At the purchase date, the shares were valued at $$15$ per share. In year $5,$ F sold $1,000$ shares for $$20$ per share. What amount is included in F$\text{'}$s employment income for tax purposes in year $1?$