This year, ABC Corporation granted a nonqualified stock option to Lisa to buy 1,000 shares of ABC stock for $25 for ten years following their vesting. At date of grant, ABC stock was selling for $25 per share and the options vest in 5 years. Eight years after ABC granted the option to Lisa, she exercised her option on all 1,000 shares of ABC stock, which was worth $60 per share at that time. How much income, if any, must she recognize in the year of exercise?