Task: Question Answering
Input (English): Passage: National Geographic Channel (UK and Ireland) -- National Geographic Channel HD is available in the UK and Ireland. It launched on 22 May 2006 on Sky channel 543. The channel joined Virgin Media's cable TV line-up on 30 July 2009. On 5 August 2009, it was also made available on UPC Ireland's cable TV service. The HD version available in the UK and Ireland was not originally a simulcast of the standard definition version of the National Geographic Channel, with some of the content coming from Rush HD, however from 1 December 2010 National Geographic Channel HD became a simulcast.
Question: what number is national geographic channel on sky
Output (English): 1