import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static long[] losts;
    static long[] exists;
    static long[] dp1;
    static long[] dp2;
    static ArrayList<ArrayList<Integer>> graph = new ArrayList<>();
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        losts = new long[n];
        for (int i = 0; i < n; i++) {
            losts[i] = sc.nextInt();
            graph.add(new ArrayList<>());
        }
        exists = new long[n];
        for (int i = 0; i < n; i++) {
            exists[i] = sc.nextInt();
        }
        for (int i = 0; i < n - 1; i++) {
            int a = sc.nextInt() - 1;
            int b = sc.nextInt() - 1;
            graph.get(a).add(b);
            graph.get(b).add(a);
        }
        dp1 = new long[n];
        dp2 = new long[n];
        calc(0, 0);
        System.out.println(Math.max(dp1[0], dp2[0]));
    }
    
    static void calc(int idx, int p) {
        dp1[idx] = losts[idx];
        for (int x : graph.get(idx)) {
            if (x == p) {
                continue;
            }
            calc(x, idx);
            dp1[idx] += Math.max(dp1[x], dp2[x]);
            dp2[idx] += Math.max(dp1[x], dp2[x] + exists[idx] + exists[x]);
        }
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}