private static int dp[][] = new int[10002][2];
private static int tree[][] = new int[10002][300];

//构建树
public static void createTree(int parent,int child){
    int i = 0;
    while (tree[parent][i]!=0) {
        i++;
    }
    tree[parent][i] = child;


}

//遍历
public static void dfs(int child, int parent){
    int child_1 = tree[child][0];
    for(int i = 0;child_1!=0;i++){
        child_1 = tree[child][i];
        dfs(child_1,child);
        System.out.println(child);
        dp[child][1] += dp[child_1][0];
        dp[child][0] += dp[child_1][1]>dp[child_1][0]?dp[child_1][1]:dp[child_1][0];


    }
}

public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    int n = scanner.nextInt();
    int root = 0;
    for(int i = 0;i<n;i++){
        int x = scanner.nextInt();
        if(i==0){
            root = x;
        }
        dp[x][1] = x;
    }
    for(int i = 0;i<n-1;i++){
        int parent = scanner.nextInt();
        int child = scanner.nextInt();
        createTree(parent,child);
    }
    dfs(root,0);
    int max = dp[root][1]>dp[root][0]?dp[root][1]:dp[root][0];
    System.out.println(max);
}