def solve():
    price1 = int(input())
    price2 = int(input())
    n = int(input())
    li = []
    cnt = 0
    for i in range(n):
        roomNo = input()
        if (isBooked(li, roomNo)):
            cnt += 1
        else:
            li.append(roomNo)
    ans = (price1 + price2) * cnt
    print(ans)


def isBooked(li, roomNo):
    for room in li:
        if (room == roomNo):
            return True
    return False


solve()