Problem: You have a rooted tree consisting of n vertices. Each vertex of the tree has some color. We will assume that the tree vertices are numbered by integers from 1 to n. Then we represent the color of vertex v as cv. The tree root is a vertex with number 1.

In this problem you need to answer to m queries. Each query is described by two integers vj, kj. The answer to query vj, kj is the number of such colors of vertices x, that the subtree of vertex vj contains at least kj vertices of color x.

You can find the definition of a rooted tree by the following link: http://en.wikipedia.org/wiki/Tree_(graph_theory).

Input

The first line contains two integers n and m (2 ≤ n ≤ 105; 1 ≤ m ≤ 105). The next line contains a sequence of integers c1, c2, ..., cn (1 ≤ ci ≤ 105). The next n - 1 lines contain the edges of the tree. The i-th line contains the numbers ai, bi (1 ≤ ai, bi ≤ n; ai ≠ bi) — the vertices connected by an edge of the tree.

Next m lines contain the queries. The j-th line contains two integers vj, kj (1 ≤ vj ≤ n; 1 ≤ kj ≤ 105).

Output

Print m integers — the answers to the queries in the order the queries appear in the input.

Examples

Input

8 5
1 2 2 3 3 2 3 3
1 2
1 5
2 3
2 4
5 6
5 7
5 8
1 2
1 3
1 4
2 3
5 3


Output

2
2
1
0
1


Input

4 1
1 2 3 4
1 2
2 3
3 4
1 1


Output

4

Note

A subtree of vertex v in a rooted tree with root r is a set of vertices {u : dist(r, v) + dist(v, u) = dist(r, u)}. Where dist(x, y) is the length (in edges) of the shortest path between vertices x and y.

Solution (in CPP):

Solution:
#include <bits/stdc++.h>
using namespace std;
int blocksize;
int msmo7;
struct query {
  int start, en, idxofquery, blockidx, mincolor;
  query() {}
  query(int l, int r, int i, int adeh) {
    start = l;
    en = r;
    idxofquery = i;
    blockidx = l / blocksize;
    mincolor = adeh;
  }
  bool operator<(const query& q) const {
    if (start / blocksize != q.start / blocksize)
      return start / blocksize < q.start / blocksize;
    else
      return en < q.en;
  }
};
query queries[100005];
vector<int> arr[100005];
int subtree[100005];
int idxinorder[100005];
int treearray[100005];
int color[100005];
int ansforquery;
int answers[100005];
int bit[100010];
int freq[100005];
const int maxn = 1e5 + 5;
void update(int idx, int val) {
  for (; idx <= maxn; idx += (idx & -idx)) bit[idx] += val;
}
int getsum(int idx) {
  int sum = 0;
  for (; idx; idx -= (idx & -idx)) sum += bit[idx];
  return sum;
}
int nid = 0;
void dfs(int s, int parent) {
  subtree[s] = 1;
  treearray[nid++] = s;
  idxinorder[s] = nid - 1;
  for (int i = 0; i < arr[s].size(); ++i) {
    int to = arr[s][i];
    if (to != parent) {
      dfs(to, s);
      subtree[s] += subtree[to];
    }
  }
}
void add(int valueofpos) {
  update(maxn - freq[color[valueofpos]]++, -1);
  update(maxn - freq[color[valueofpos]], 1);
}
void rem(int valueofpos) {
  update(maxn - freq[color[valueofpos]]--, -1);
  update(maxn - freq[color[valueofpos]], 1);
}
int main() {
  int n, m;
  scanf("%d", &n);
  scanf("%d", &m);
  for (int i = 1; i <= n; ++i) scanf("%d", &color[i]);
  int u, v;
  for (int i = 1; i < n; ++i) {
    scanf("%d", &u);
    scanf("%d", &v);
    arr[u].push_back(v);
    arr[v].push_back(u);
  }
  dfs(1, -1);
  blocksize = sqrt(n);
  int k;
  for (int i = 0; i < m; ++i) {
    scanf("%d", &v);
    scanf("%d", &k);
    queries[i].start = idxinorder[v];
    queries[i].en = queries[i].start + subtree[v] - 1;
    queries[i].idxofquery = i;
    queries[i].mincolor = k;
  }
  sort(queries, queries + m);
  int curl = 0;
  int curr = -1;
  for (int i = 0; i < m; ++i) {
    query& qu = queries[i];
    while (curl > qu.start) add(treearray[--curl]);
    while (curr < qu.en) add(treearray[++curr]);
    while (curl < qu.start) rem(treearray[curl++]);
    while (curr > qu.en) rem(treearray[curr--]);
    answers[qu.idxofquery] = getsum(maxn - qu.mincolor);
  }
  for (int i = 0; i < m; ++i) printf("%d\n", answers[i]);
  return 0;
}