simple question :) Getting the main site Site Name

marketpress.php has the following line to obtain the sub-blog site name and set it is as "mail_from_name" for the order confirmation email sent to the customer.

add_filter( 'wp_mail_from_name', create_function('', 'return get_bloginfo("name");') );

How to change it to use the main site's Site Name as the "mail_from_name"?

Happy Holidays!