import Control.Monad
import Control.Applicative
import Data.List

helper n a b =
  if n == 1
    then "Hello World"
    else show (a + b)

readInt :: IO Int
readInt = readLn

main :: IO ()
main = do
  n <- readInt
  if n == 1
    then putStrLn "Hello World"
    else do
      a <- readInt
      b <- readInt
      print $ a + b