def Loss(P1,P2):
    loss=P1+P2
    return (loss)

P1=int(input())
P2=int(input())
N=int(input())
R=[]
for i in range(N):
    R.append(input())
before=len(R)
R=list(set(R))
after=len(R)
count=before-after



loss=count*Loss(P1,P2)
print(loss)