from collections import Counter
P1 = int(input())
P2 = int(input())
N = int(input())

R = [int(input()) for i in range(N)]
cnter = Counter(R)
loss = 0
one_loss = P1 + P2
for key in cnter.keys():
    cnt = cnter.get(key)
    if cnt > 1:
        loss += one_loss * (cnt - 1)
print(loss)