p1 = int(input())
p2 = int(input())
N  = int(input())
R1 = []
for i in range(N):
	R1.append(int(input()))

visited = [False for i in range(1000)]
res = 0
for v in R1:
	if (visited[v]): res += p1 + p2
	visited[v] = True
	
print(res)