n=int(input())
a=[int(i) for i in input().split()]
b=[int(i) for i in input().split()]
c=[int(i) for i in input().split()]
ans=0

for i in range(n):
    eat=a[i]-1
    ans+=b[eat]
    if eat!=n-1 and i!=n-1:
        ans+=c[eat]
print(ans)