class segtree():
    n=1
    size=1
    log=2
    d=[0]
    op=None
    e=10**15
    def __init__(self,V,OP,E):
        self.n=len(V)
        self.op=OP
        self.e=E
        self.log=(self.n-1).bit_length()
        self.size=1<<self.log
        self.d=[E for i in range(2*self.size)]
        for i in range(self.n):
            self.d[self.size+i]=V[i]
        for i in range(self.size-1,0,-1):
            self.update(i)
    def set(self,p,x):
        assert 0<=p and p<self.n
        p+=self.size
        self.d[p]=x
        for i in range(1,self.log+1):
            self.update(p>>i)
    def get(self,p):
        assert 0<=p and p<self.n
        return self.d[p+self.size]
    def prod(self,l,r):
        assert 0<=l and l<=r and r<=self.n
        sml=self.e
        smr=self.e
        l+=self.size
        r+=self.size
        while(l<r):
            if (l&1):
                sml=self.op(sml,self.d[l])
                l+=1
            if (r&1):
                smr=self.op(self.d[r-1],smr)
                r-=1
            l>>=1
            r>>=1
        return self.op(sml,smr)
    def all_prod(self):
        return self.d[1]
    def max_right(self,l,f):
        assert 0<=l and l<=self.n
        assert f(self.e)
        if l==self.n:
            return self.n
        l+=self.size
        sm=self.e
        while(1):
            while(l%2==0):
                l>>=1
            if not(f(self.op(sm,self.d[l]))):
                while(l<self.size):
                    l=2*l
                    if f(self.op(sm,self.d[l])):
                        sm=self.op(sm,self.d[l])
                        l+=1
                return l-self.size
            sm=self.op(sm,self.d[l])
            l+=1
            if (l&-l)==l:
                break
        return self.n
    def min_left(self,r,f):
        assert 0<=r and r<self.n
        assert f(self.e)
        if r==0:
            return 0
        r+=self.size
        sm=self.e
        while(1):
            r-=1
            while(r>1 & (r%2)):
                r>>=1
            if not(f(self.op(self.d[r],sm))):
                while(r<self.size):
                    r=(2*r+1)
                    if f(self.op(self.d[r],sm)):
                        sm=self.op(self.d[r],sm)
                        r-=1
                return r+1-self.size
            sm=self.op(self.d[r],sm)
            if (r& -r)==r:
                break
        return 0
    def update(self,k):
        self.d[k]=self.op(self.d[2*k],self.d[2*k+1])
N = int(input())
P = [0] + list(map(int, input().split()))
A = list(map(int, input().split()))
B = list(map(int, input().split()))
C = [[] for i in range(N)]
for i in range(N):
    A[i] -= 1
    P[i] -= 1
    if i > 0:
        C[P[i]].append(i)
m = [10 ** 9] * N
M = [-1] * N
et = []
from collections import deque
st = deque([0])
i = 0
while len(st):
    v = st.pop()
    if v < 0:
        v = ~v
        if et[-1] == v:
            continue
        et.append(v)
        m[v] = min(m[v], i)
        M[v] = max(m[v], i)
        i += 1
    else:
        et.append(v)
        m[v] = min(m[v], i)
        M[v] = max(m[v], i)
        i += 1
        for c in C[v]:
            st.append(~v)
            st.append(~c)
            st.append(c)

V = [i for i in range(N)]
V.sort(key = lambda x: -A[x])
seg = segtree([0] * len(et), lambda x, y: max(x, y), 0)
dp = [0] * N
for v in V:
    for c in C[v]:
        dp[v] += seg.prod(m[c], M[c] + 1)
    dp[v] += B[v]
    seg.set(m[v], dp[v])
ans = 0
depth = [-1] * N
qu = deque([0])
while len(qu):
    v = qu.popleft()
    for c in C[v]:
        qu.append(c)
        depth[c] = depth[v] + 1
V.sort(key = lambda x: -depth[x])
for v in V:
    tmp = 0
    for c in C[v]:
        tmp += seg.prod(m[c], M[c] + 1)
    dp[v] = max(dp[v], tmp)
    seg.set(m[v], dp[v])

print(max(dp))