import Data.List

main :: IO()
main = do
        n <- readLn
        getLine
        xs <- sort.map read.words <$> getLine
        print $ solve n xs 0

solve n [x] m | (n - x) < 0 = m
              | otherwise = m + 1
solve n (x:xs) m | (n - x) < 0 = m
                 | otherwise   = solve (n - x) xs (m + 1)