p_1 = int(input())
p_2 = int(input())
n = int(input())
res_list = []
calculated_list = []
amount = 0

for res in range(n):
    res_list.append(int(input()))

for res in res_list:
    counter = res_list.count(res)
    if counter > 1 and res not in calculated_list:
        amount += (p_1 + p_2) * (counter - 1)
        calculated_list.append(res)

print(amount)