t1 = int(input())
t2 = int(input())
n = int(input())
r = [int(input()) for _ in range(n)]
r_set = set(r)
ans = 0

for i in r_set:
    if r.count(i) == 1:
        continue
    elif r.count(i) >= 2:
        ans += (t1 + t2) * (r.count(i) - 1)
print(ans)