gmail inbox count google spreadsheet script

The script as described in http://www.rossgoodman.com/2012/10/26/inbox-zero-and-quantified-self/ ready to copy and paste:

function myFunction() {
var doc = SpreadsheetApp.getActiveSheet()
var firstEmptyRow = doc.getLastRow() + 1;
var gmailUnread = GmailApp.getInboxUnreadCount();
var gmailInbox = GmailApp.search('in:inbox').length
var gmailStarred = GmailApp.search('in:starred').length
var gmailSpam = GmailApp.search('in:spam').length
doc.getRange(firstEmptyRow, 1, 1, 1).setValue(new Date().getYear() +"-" + ("0" + (new Date().getMonth() +1)).slice(-2)  + "-" + ("0" + new Date().getDate()).slice(-2));
doc.getRange(firstEmptyRow, 2, 1, 1).setValue(gmailUnread);
doc.getRange(firstEmptyRow, 3, 1, 1).setValue(gmailInbox);
doc.getRange(firstEmptyRow, 4, 1, 1).setValue(gmailStarred);
doc.getRange(firstEmptyRow, 5, 1, 1).setValue(gmailSpam);
}