N = int(input())
A = list((map(int,input().split())))
B = list((map(int,input().split())))
C = list((map(int,input().split())))
 
total = sum(B)
point = 0
for i in range(len(A) - 1):
    if A[i] + 1 == A[i+1]:
        point = point+C[i-1]
        print(point)
print(total+point)