Expresso Company had the following information related to common and preferred shares during the year:

Common shares outstanding	1/1	455,000
Common shares repurchased	3/31	14,000
Conversion of preferred shares	6/30	26,000
Common shares repurchased	12/1	23,400

Expresso reported net income of $1,300,000 at December 31. What amount of shares should Expresso use as the denominator in the computation of basic earnings per share?