import Data.List

isKadomatsu :: Integer -> Integer -> Integer -> Bool
isKadomatsu a b c = (a /= b && b /= c && a /= c) && (b == max || b == min)
	where max = maximum [a,b,c];
		  min = minimum [a,b,c];

isIncreasedKadomatsu :: [Integer] -> Bool
isIncreasedKadomatsu (a:b:[]) = True
isIncreasedKadomatsu (a:b:c:xs) =
	if a < c && isKadomatsu a b c
		then isIncreasedKadomatsu (b:c:xs)
		else False

main = do
	seq <- getLine >>= return . permutations . map (read::String->Integer) . words
	putStrLn $ if or (map isIncreasedKadomatsu seq) then "YES" else "NO"