Google Apps Script to get notified about the number of unread emails in an inbox

unreadCount.gs

function unreadCount() {
   var unreadCount = GmailApp.getInboxUnreadCount();
  
   var masterEmail = "<[email protected]>";
   var subject = "Your unread count";
   var message = "You have " + unreadCount + " emails"
   MailApp.sendEmail(masterEmail, subject, message);
}