import Data.List
main = getLine >> getContents >>= putStrLn . solve . map (map read . words) . lines

solve :: [[Int]] -> String
solve [zs, ys]
    | acc' < mnum' = "NO"
    | otherwise = "YES"
    where
        (acc', mnum', _) = foldl ff (0, 0, zs) ys
        ff (acc, mnum, xs) y
            | y == 0 = (acc + head x', max mnum $ head x', xs')
            | otherwise = (acc, max mnum $ head x', xs')
            where
                (x', xs') = splitAt 1 xs