let () =
    let split s =
        let rec loop i cur flag acc =
            if i = String.length s then ( if flag then cur :: acc else acc) else (
                match flag, s.[i] with
                | true,  ' ' -> loop (i + 1) "" false (cur :: acc)
                | false, ' ' -> loop (i + 1) "" false acc
                | true,  v   -> loop (i + 1) (Printf.sprintf "%s%c" cur v) true acc
                | false, v   -> loop (i + 1) (Printf.sprintf "%s%c" cur v) true acc
            )
        in
        List.map int_of_string (List.rev (loop 0 "" false []))
    in
    let main () =
        let n = int_of_string (read_line ()) in
        let a = Array.of_list (split (read_line ())) in
        let b = Array.of_list (split (read_line ())) in
        let c = Array.of_list (split (read_line ())) in
        let rec loop i acc =
            if i = n then acc else
                let s = b.(a.(i) - 1) in
                let s = if i < n - 1 && a.(i) + 1 = a.(i + 1) then s + c.(a.(i) - 1) else s in
                loop (i + 1) (acc + s)
        in
        let r = loop 0 0 in
        Printf.printf "%d\n" r
    in
    main ()