import Data.List
main::IO()
main = do
  boxLength <-read <$> getLine
  blockNum <-read <$> getLine
  --先頭boxLength個のdataを対象に
  blockWiS <-fmap (take blockNum . fmap read . words) getLine
  
  print . length . takeWhile (< boxLength) . scanl1 (+) .  sort 
    $ blockWiS