import qualified Data.Vector.Unboxed as U
import qualified Data.Vector as V
import qualified Data.ByteString.Char8 as C
import Debug.Trace
import Data.List
import Control.Monad
import Data.Ord
import qualified Data.Sequence as Seq
import qualified Data.IntSet as IS
import qualified Data.Set as S

r :: Int -> IO (U.Vector Int)
r n = U.unfoldrN n (C.readInt . C.dropWhile (==' ')) <$> C.getLine

r' :: IO [Int]
r'  =   unfoldr    (C.readInt . C.dropWhile (==' ')) <$> C.getLine

rp :: IO (Int,Int)
rp  = toTup . unfoldr    (C.readInt . C.dropWhile (==' ')) <$> C.getLine

toTup [a,b] = (a,b)



main :: IO ()
main = do
    n <- readLn :: IO Int
    ls <- r'
    -- naïve
    print $ (`div` 6) $ S.size $ S.filter trianble $ S.fromList $ map (take 3) $ permutations ls


trianble [a,b,c] = a < b + c && b < c + a && c < a + b

