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

a = []

for k in R:
    if k not in a:
        a.append(k)
    else:
        continue

K = len(a)

A = (N - K) * (P1 + P2)

print(A)