On January 1, 2021, Horsebarn, Inc had 375,000 shares of its $2 par value common stock outstanding. On March 1, Horsebarn sold an additional 750,000 shares on the open market at $20 per share. Horsebarn issued a 20% stock dividend on May 1. On September 1, Horsebarn purchased 420,000 shares as treasury stock. What is the weighted-average number of shares outstanding for 2021?