module IO = struct

  (* @since 4.04.0 *)
  let split_on_char sep s =
    let open String in
    let r = ref [] in
    let j = ref (length s) in
    for i = length s - 1 downto 0 do
      if get s i = sep then begin
        r := sub s (i + 1) (!j - i - 1) :: !r;
        j := i
      end
    done;
    sub s 0 !j :: !r

  let read_ss () = read_line () |> split_on_char ' '

end

module B = Big_int

let () =
  read_int () |> ignore;
  IO.read_ss () |> List.map B.big_int_of_string
  |> List.fold_left B.add_big_int B.zero_big_int |> B.string_of_big_int
  |> print_endline