import sys
input = sys.stdin.readline
from collections import deque
class Tree:
  def __init__(self, N):
    self.V = N
    self.edge = [[] for _ in range(N)]
  
  def add_edges(self, ind=1, bi=True):
    for i in range(self.V-1):
      a,b = map(int, input().split())
      a -= ind; b -= ind
      self.edge[a].append(b)
      if bi:
        self.edge[b].append(a)

  def add_edge(self, a, b, bi=True):
    self.edge[a].append(b)
    if bi:
      self.edge[b].append(a)

  def dfs(self, start):
    stack = deque([start])
    self.parent = [N]*N
    self.parent[start] = -1
    order = [start]
    self.offs = A[:]
    self.ons = [0]*self.V
    #記録したい値の配列を定義
    while stack:
      v = stack.pop()
      for u in self.edge[v]:
        if u==self.parent[v]:
          continue
        self.parent[u]=v
        stack.append(u)
        order.append(u)
    for v in order[::-1]:
      for u in self.edge[v]:
        if u==self.parent[v]:
          continue
        #　帰りがけ処理
        self.offs[v] += self.offs[u]
        self.ons[v] += self.ons[u]
      if v==start:
        pass
        #根の帰りがけまとめ処理
      else:
        self.offs[v], self.ons[v] = max(self.offs[v],self.ons[v]), max(self.offs[v],self.ons[v]+B[v]+B[self.parent[v]])
        #根以外の帰りがけまとめ処理
    return
  
  def bfs(self, start):
    d = deque()
    self.min_cost = [-1]*self.V
    self.min_cost[start]=0
    d.append(start)
    while len(d)>0:
      v = d.popleft()
      for w in self.edge[v]:
        if self.min_cost[w]==-1:
          self.min_cost[w]=self.min_cost[v]+1
          d.append(w)
    return

N = int(input())
A = list(map(int, input().split()))
B = list(map(int, input().split()))
G = Tree(N)
G.add_edges(ind=1, bi=True)
G.dfs(0)
print(max(G.offs[0], G.ons[0]))