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;
inline bool checkBit(long long n, int i) { return n & (1LL << i); }
inline long long setBit(long long n, int i) { return n | (1LL << i); }
inline long long resetBit(long long n, int i) { return n & (~(1LL << i)); }
inline bool EQ(double a, double b) { return fabs(a - b) < 1e-9; }
inline double dist(double ix, double iy, double jx, double jy) {
  return sqrt(((ix - jx) * (ix - jx)) + ((iy - jy) * (iy - jy)));
}
int marked[1000000 / 64 + 2];
bool isPrime(int x) {
  return (x > 1) &&
         ((x == 2) ||
          ((x & 1) && (!((marked[x >> 6] & (1 << ((x & 63) >> 1)))))));
}
void seive(int n) {
  int i, j;
  for (i = 3; i * i <= n; i += 2) {
    if (!(marked[i >> 6] & (1 << ((i & 63) >> 1)))) {
      for (j = i * i; j <= n; j += i << 1) {
        marked[j >> 6] |= (1 << ((j & 63) >> 1));
      }
    }
  }
}
long long bigMod(long long a, long long b) {
  long long r = 1;
  while (b) {
    if (b & 1) (r *= a) %= 1000000007;
    b >>= 1;
    (a *= a) %= 1000000007;
  }
  return r;
}
long long add(long long a, long long b) {
  long long ret = a + b;
  if (ret >= 1000000007) ret -= 1000000007;
  return ret;
}
long long sub(long long a, long long b) {
  long long ret = a - b;
  if (ret < 0) ret += 1000000007;
  return ret;
}
int bigChild[100007], so_far, now, col[100007], cnt[100007], n;
bool big[100007];
long long ans[100007];
vector<int> edge[100007];
int tree[100007];
vector<pair<int, int> > q[100007];
void update(int idx, int val) {
  while (idx <= n + 1) {
    ;
    tree[idx] += val;
    idx += (idx & -idx);
  }
}
int query(int idx) {
  int sum = 0;
  while (idx) {
    sum += tree[idx];
    idx -= (idx & -idx);
  }
  return sum;
}
int fsz(int i, int pre) {
  int ret = 1, mx = 0;
  for (auto it : edge[i]) {
    if (it == pre) continue;
    int p = fsz(it, i);
    if (mx < p) {
      mx = p;
      bigChild[i] = it;
    }
    ret += p;
  }
  return ret;
}
void add(int i, int pre, int x) {
  ;
  update(cnt[col[i]] + 1, -1);
  ;
  cnt[col[i]] += x;
  update(cnt[col[i]] + 1, +1);
  for (auto it : edge[i])
    if (it != pre && !big[it]) add(it, i, x);
}
void dfs(int i, int pre, bool keep) {
  for (auto it : edge[i])
    if (it != pre && it != bigChild[i]) dfs(it, i, 0);
  if (bigChild[i]) dfs(bigChild[i], i, 1), big[bigChild[i]] = 1;
  add(i, pre, 1);
  for (auto it : q[i])
    if (it.first <= n + 1) ans[it.second] = query(n + 1) - query(it.first);
  if (bigChild[i]) big[bigChild[i]] = 0;
  if (keep == 0) {
    add(i, pre, -1);
  }
}
int main() {
  int i, u, v, m;
  scanf("%d %d", &n, &m);
  for (i = 1; i <= n; i++) scanf("%d", &col[i]);
  for (i = 1; i < n; i++) {
    scanf("%d %d", &u, &v);
    edge[u].push_back(v);
    edge[v].push_back(u);
  }
  for (i = 0; i < m; i++) {
    scanf("%d %d", &u, &v);
    q[u].push_back({v, i});
  }
  update(1, n);
  ;
  fsz(1, -1);
  ;
  dfs(1, -1, 0);
  ;
  for (i = 0; i < m; i++) printf("%lld ", ans[i]);
  printf("\n");
  return 0;
}