Zero if you use one of the many Greasemonkey scripts available: http://userscripts.org/scripts/search?q=ycombinator http://userscripts.org/scripts/search?q=ycom

Zero if you use one of the many Greasemonkey scripts available: http://userscripts.org/scripts/search?q=ycombinator http://userscripts.org/scripts/search?q=ycombinator