In $2000,$ you were granted $600$ ISOs by your employer with a strike price of $$5/$share$.$ In $2004$ when the options vested, the company's stock was trading for $$7/$share$.$ In $2006,$ you exercised all $600$ options when the stock was trading for $$10/$share$.$ You sold the shares $15$ months later in $2008$ for $$14/$share$.$

How much should you include in gross income when you sell the shares in $2008?$