how to get mutt new mails' number

[vinurs]

Hi,all
       I am a newcomer to mutt, Is there any method to show that how
many new mails and how many mails in all in my mailboxs
       i read the mutt manual ,but i can not find a command to get the result!
       for example, i have a inbox call gmail, in it, there has 15 new
mails and 30 mails in all, then i want a mutt command to return the
numbers and let other shell command use it!