let read() = stdin.ReadLine() |> int

let P1 = read()
let P2 = read()
let N  = read()
let R  = Array.init N (fun _ -> read())

let lossPerCase = P1+P2
let case = (R |> Array.length) - (R |> Array.distinct |> Array.length)
let loss = lossPerCase*case

loss |> printfn "%i"