P1 = int(input())
P2 = int(input())
N = int(input())
R = []
OPPORTUNITY = 0
TRANSFER = 0
for i in range(N) :
    r = int(input())
    if r not in R :
        R.append(r)
    else :
        OPPORTUNITY += P1
        TRANSFER += P2
print(OPPORTUNITY + TRANSFER)