On January 1, 2020, Niles Co. granted 5 million of its no par common shares to executives, subject to forfeiture if employment is terminated within 4 years. On that date, the shares had a market value of $16. Niles is now preparing its diluted earnings per share calculation 2 years later as of December 31, 2021. If the market price of the shares averaged $20 during 2021, what number of shares should be added to the denominator in this calculation to reflect the future dilutive impact of these RSUs?