def main():
    P1 = int(input())
    P2 = int(input())
    N = int(input())
    R = [int(input()) for _ in range(N)]

    books = set()
    loss = 0
    for book in R:
        if book in books:
            loss += P1 + P2
        books.add(book)

    print(loss)


if __name__ == "__main__":
    main()