let readNum () =
  stdin.ReadLine ()
  |> System.Int32.TryParse
  |> snd

let ans =
  match readNum () with
    | 1 -> "Hello World"
    | 2 -> 
      let a, b = (readNum ()), (readNum ()) in
      sprintf "%d" (a + b)
    | _ -> failwith "Invalid Value"

printfn "%s" ans