e = int(input())
l = int(input())

dic = {}
n = int(input())

for i in range(n):
    r = int(input())
    if r in dic:
        dic[r] += 1
    else:
        dic[r]= 1

loss = 0
for v in dic.values():
    if v >= 2:
        loss += (e * (v - 1) + l * (v - 1))

print(loss)