Fortunately, still plenty of oxygen to spare.
From Space.com:
Russian flight controllers used 7.1 pounds of the 110 pounds of oxygen and air aboard Progress 16, which arrived on Dec. 25 and contained about a two-week supply, Navias said during ISS mission commentary today.
Additional oxygen sources aboard the ISS include a 42-day supply in the form of solid fuel canisters, as well as two full tanks inside the U.S.-built Quest airlock.
And of course, if worst ever came to worst, they'd just come home on the parked Soyuz.