Stine Inc. had 300000 shares of common stock issued and outstanding at December 31, 2010. On July 1, 2011 an additional 300000 shares were isssued for cash. Stine also had stock options outstanding at the beginning and end of 2011 which allow the holders to purchase 90000 shares of common stock at $28 per share. The average market price of Stine's common stock was $35 during 2011. The number of shares to be used in computing diluted earnings per share is what?