yuki_hotel_price = int(input())
transfer_hotel_price = int(input())
booking_num = int(input())
booking_room_numbers = []
transferred_room_numbers = []
for i in range(booking_num):
  booking_room_numbers.append(int(input()))

loss_amount = 0
for num in booking_room_numbers:
  # 振替済みなら何もしない
  if num in transferred_room_numbers:
    continue

  # 重複予約
  double_booking_num = booking_room_numbers.count(num)
  if double_booking_num >= 2:
    # 損失費用の加算
    loss_amount += (double_booking_num - 1)*yuki_hotel_price + (double_booking_num - 1)*transfer_hotel_price

    # 振替済みに追加
    transferred_room_numbers.append(num)
print(loss_amount)