def main():
    p1 = int(input())
    p2 = int(input())
    n = int(input())
    r = {}
    for i in range(n):
        j = int(input())
        if j in r:
            r[j] += 1
        else:
            r[j] = 0
    ans = (p1+p2)*sum(r.values())
    print(ans)


if __name__ == "__main__":
    main()