open System open System.Collections.Generic [] module Cin = let read f = stdin.ReadLine() |> f let reada f = stdin.ReadLine().Split() |> Array.map f let readChars() = read string |> Seq.toArray let readInts() = readChars() |> Array.map (fun x -> Convert.ToInt32(x.ToString())) [] module Cout = let writer = new IO.StreamWriter(new IO.BufferedStream(Console.OpenStandardOutput())) let print (s: string) = writer.Write s let println (s: string) = writer.WriteLine s let inline puts (s: ^a) = string s |> println let solve() = let p1 = read int64 let p2 = read int64 let n = read int let mutable mp = Dictionary() for i in 0 .. n - 1 do let r = read int64 if mp.ContainsKey(r) then mp.[r] <- mp.[r] + 1L else mp.Add(r, 1L) seq { for kv in mp do let k, v = kv.Key, kv.Value if v > 1L then yield (p1 + p2) * (v - 1L) } |> Seq.sum |> puts [] let main _ = try solve() with e -> printfn "%s" (e.ToString()) writer.Close() 0 // return an integer exit code