N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = list(map(int, input().split()))
happiness = 0
memory = 100
for i in range(N):
  happiness += B[A[i]]
  if memory + 1 == A[i]:
    happiness += C[A[i]-1]
  memory = A[i]
print(happiness)