<human>: Does the sentence "On June 25, 2006, Warren Buffett (then the world's richest person, estimated worth of US$62 billion as of April 16, 2008) pledged to give the foundation approximately 10 million Berkshire Hathaway Class B shares spread over multiple years through annual contributions, with the first year's donation of 500,000 shares being worth approximately US$1.5 billion." provide a valid answer to the question "How many shares of berkshire hathway was pledged as a donation"
OPTIONS:
- yes
- no
<bot>: yes