import scala.io.StdIn.readLine

/**
 * Created by sonetsuyoshi on 2015/12/16.
 */
object Main extends App {
  val arg = readLine.split(" ").map(_.toInt)
  val N = arg.apply(0)
  val A = arg.apply(1)
  val B = arg.apply(2)

  val x = readLine.split(" ").map(_.toInt)

  val ans = 1.until(N).foldLeft(0.toLong)((s, i) => s + math.min((x(i) - x (i - 1)) * A, B)
  )

  println(ans)
}