import qualified Data.Text as T
import qualified Data.Text.IO as T
import qualified Data.Text.Read as T
import Data.List (sort)

main :: IO ()
main = do
  [n, k] <- map unsafeTextToInt . T.words <$> T.getLine :: IO [Int]
  ps <- map unsafeTextToInt . T.words <$> T.getLine :: IO [Int]
  print . sum . take k . sort $ ps

unsafeTextToInt :: T.Text -> Int
unsafeTextToInt s = case T.signed T.decimal s of
  Right (n, _) -> n
{-# INLINE unsafeTextToInt #-}
