Scanf.scanf "%d %d %d" (fun p1 p2 n ->
    let res = Array.make 1000 0 in
    let rec loop i acc =
        if i = n then acc else
            let acc = Scanf.scanf " %d" (fun r ->
                res.(r) <- res.(r) + 1;
                if res.(r) > 1 then acc + p1 + p2 else acc
            )
            in
            loop (i + 1) acc
    in
    loop 0 0 |> Printf.printf "%d\n"
)