N = int(input())
Alist = list(map(int, input().split()))
Blist = list(map(int, input().split()))
Clist = list(map(int, input().split()))

manzokudo = 0
for B in Blist:
    manzokudo += B
    
for i in range(0, N-1):
    if Alist[i]+1 == Alist[i+1]:
        manzokudo += Clist[i-1]

print(manzokudo)