RockField Co. had 10,000 shares of common stock outstanding as of January 1. The following events occurred during the year:

4/1 Issued 3,000 shares of common stock.

7/1 Distributes 20% stock dividend 10/1 Purchases 4000 shares of stock for treasury.

10/1 Purchases 4000 shares of stock for treasury

12/1 declares and distributes a 3 to 1 stock split.

What is the weighted average number of shares to be used for computing Earnings Per Share?