def main():
    P1, P2, N = (int(input()) for _ in [0] * 3)
    R = tuple(int(input()) for _ in [0] * N)

    room = dict()
    for i in R:
        room[i] = room.get(i, 0) + 1

    loss = 0
    for v in room.values():
        if v > 1:
            n = v - 1
            loss += P1 * n + P2 * n

    print(loss)

main()