#define MOD_TYPE 1

#pragma region Macros

#include <bits/stdc++.h>
using namespace std;

#if 1
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#endif

#if 0
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/tag_and_trait.hpp>
#include <ext/rope>
using namespace __gnu_pbds;
using namespace __gnu_cxx;
template <typename T>
using extset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#endif

#if 0
#include <boost/multiprecision/cpp_int.hpp>
#include <boost/multiprecision/cpp_dec_float.hpp>
using Int = boost::multiprecision::cpp_int;
using lld = boost::multiprecision::cpp_dec_float_100;
#endif

using ll = long long int;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pld = pair<ld, ld>;
template <typename T>
using smaller_queue = priority_queue<T, vector<T>, greater<T>>;

constexpr ll MOD = (MOD_TYPE == 1 ? (ll)(1e9 + 7) : 998244353);
constexpr int INF = (int)1e9 + 10;
constexpr ll LINF = (ll)4e18;
constexpr ld PI = acos(-1.0);
constexpr ld EPS = 1e-7;
constexpr int Dx[] = {0, 0, -1, 1, -1, 1, -1, 1, 0};
constexpr int Dy[] = {1, -1, 0, 0, -1, -1, 1, 1, 0};

#define REP(i, m, n) for (ll i = m; i < (ll)(n); ++i)
#define rep(i, n) REP(i, 0, n)
#define REPI(i, m, n) for (int i = m; i < (int)(n); ++i)
#define repi(i, n) REPI(i, 0, n)
#define MP make_pair
#define MT make_tuple
#define YES(n) cout << ((n) ? "YES" : "NO") << "\n"
#define Yes(n) cout << ((n) ? "Yes" : "No") << "\n"
#define possible(n) cout << ((n) ? "possible" : "impossible") << "\n"
#define Possible(n) cout << ((n) ? "Possible" : "Impossible") << "\n"
#define all(v) v.begin(), v.end()
#define NP(v) next_permutation(all(v))
#define dbg(x) cerr << #x << ":" << x << "\n";

struct io_init
{
  io_init()
  {
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << setprecision(30) << setiosflags(ios::fixed);
  };
} io_init;
template <typename T>
inline bool chmin(T &a, T b)
{
  if (a > b)
  {
    a = b;
    return true;
  }
  return false;
}
template <typename T>
inline bool chmax(T &a, T b)
{
  if (a < b)
  {
    a = b;
    return true;
  }
  return false;
}
inline ll CEIL(ll a, ll b)
{
  return (a + b - 1) / b;
}
template <typename A, size_t N, typename T>
inline void Fill(A (&array)[N], const T &val)
{
  fill((T *)array, (T *)(array + N), val);
}
template <typename T, typename U>
constexpr istream &operator>>(istream &is, pair<T, U> &p) noexcept
{
  is >> p.first >> p.second;
  return is;
}
template <typename T, typename U>
constexpr ostream &operator<<(ostream &os, pair<T, U> &p) noexcept
{
  os << p.first << " " << p.second;
  return os;
}
#pragma endregion

random_device seed_gen;
mt19937_64 engine(seed_gen());

// --------------------------------------

template <typename T>
struct Tree
{
  int V;
  using P = pair<int, T>;
  vector<vector<P>> E;
  vector<int> par, depth, in, out;
  vector<T> dist;
  vector<vector<int>> par_double;

  Tree(int V) : V(V)
  {
    E.resize(V);
    depth.resize(V);
    dist.resize(V);
    in.resize(V);
    out.resize(V);
  }

  void read(int index = 1, bool ini = true)
  {
    int a, b;
    for (int i = 0; i < V - 1; i++)
    {
      cin >> a >> b, a -= index, b -= index;
      E[a].push_back({b, 1});
      E[b].push_back({a, 1});
    }
    if (ini)
      init();
  }

  void add_edge(int a, int b, T w = 1)
  {
    E[a].push_back({b, w});
    E[b].push_back({a, w});
  }

  void dfs(int v, int d, T w, int &i)
  {
    in[v] = i++;
    depth[v] = d;
    dist[v] = w;
    for (auto [c, di] : E[v])
    {
      if (par[v] == c)
        continue;
      par[c] = v;
      dfs(c, d + 1, w + di, i);
    }
    out[v] = i;
  }

  inline int sub(int v) { return out[v] - in[v]; }

  void init(int root = 0)
  {
    calculated = false;
    par.assign(V, -1);
    int i = 0;
    dfs(root, 0, 0, i);
  }

  bool calculated;
  void calc_double()
  {
    par_double.assign(V, vector<int>(25));
    for (int i = 0; i < V; i++)
      par_double[i][0] = par[i];

    for (int k = 0; k < 24; k++)
    {
      for (int i = 0; i < V; i++)
      {
        if (par_double[i][k] == -1)
          par_double[i][k + 1] = -1;
        else
          par_double[i][k + 1] = par_double[par_double[i][k]][k];
      }
    }
  }

  int getLCA(int a, int b)
  {
    if (!calculated)
      calc_double(), calculated = true;

    if (a == b)
      return a;
    if (depth[a] < depth[b])
      swap(a, b);
    for (int k = 24; k >= 0; k--)
    {
      if (par_double[a][k] != -1 && depth[par_double[a][k]] >= depth[b])
        a = par_double[a][k];
    }
    if (a == b)
      return a;
    for (int k = 24; k >= 0; k--)
    {
      if (par_double[a][k] != -1 && par_double[a][k] != par_double[b][k])
      {
        a = par_double[a][k];
        b = par_double[b][k];
      }
    }
    return par_double[a][0];
  }

  int length(int a, int b) { return depth[a] + depth[b] - 2 * depth[getLCA(a, b)]; }

  T distance(int a, int b) { return dist[a] + dist[b] - 2 * dist[getLCA(a, b)]; }

  T diameter(int &a, int &b)
  {
    T Max(-1), d;
    for (int i = 0; i < V; i++)
    {
      d = distance(0, i);
      if (Max < d)
        Max = d, a = i;
    }
    for (int i = 0; i < V; i++)
    {
      d = distance(a, i);
      if (Max < d)
        Max = d, b = i;
    }
    return Max;
  }

  T diameter()
  {
    int a, b;
    return diameter(a, b);
  }

  int unweighted_diameter(int &a, int &b)
  {
    int Max = 1, d;
    for (int i = 0; i < V; i++)
    {
      d = length(0, i);
      if (Max < d)
        Max = d, a = i;
    }
    for (int i = 0; i < V; i++)
    {
      d = length(a, i);
      if (Max < d)
        Max = d, b = i;
    }
    return Max;
  }

  int unweighted_diameter()
  {
    int a, b;
    return unweighted_diameter(a, b);
  }
};

void solve()
{
  int n, q;
  cin >> n >> q;
  Tree<int> tr(n);
  rep(i, n - 1)
  {
    int a, b;
    cin >> a >> b;
    a--, b--;
    tr.add_edge(a, b);
  }
  tr.init();
  ll sum = 0;
  rep(i, q)
  {
    int p;
    ll x;
    cin >> p >> x;
    p--;
    sum += x * tr.sub(p);
    cout << sum << "\n";
  }
}

int main()
{
  solve();
}