//#define NDEBUG
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <iostream>
#include <utility>
#include <vector>

namespace n91 {

using i8 = std::int_fast8_t;
using i32 = std::int_fast32_t;
using i64 = std::int_fast64_t;
using u8 = std::uint_fast8_t;
using u32 = std::uint_fast32_t;
using u64 = std::uint_fast64_t;
using isize = std::ptrdiff_t;
using usize = std::size_t;

struct rep {
  struct itr {
    usize i;
    constexpr itr(const usize i) noexcept : i(i) {}
    void operator++() noexcept { ++i; }
    constexpr usize operator*() const noexcept { return i; }
    constexpr bool operator!=(const itr x) const noexcept { return i != x.i; }
  };
  const itr f, l;
  constexpr rep(const usize f, const usize l) noexcept
      : f(std::min(f, l)), l(l) {}
  constexpr auto begin() const noexcept { return f; }
  constexpr auto end() const noexcept { return l; }
};
struct revrep {
  struct itr {
    usize i;
    constexpr itr(const usize i) noexcept : i(i) {}
    void operator++() noexcept { --i; }
    constexpr usize operator*() const noexcept { return i; }
    constexpr bool operator!=(const itr x) const noexcept { return i != x.i; }
  };
  const itr f, l;
  constexpr revrep(const usize f, const usize l) noexcept
      : f(l - 1), l(std::min(f, l) - 1) {}
  constexpr auto begin() const noexcept { return f; }
  constexpr auto end() const noexcept { return l; }
};
template <class T> auto md_vec(const usize n, const T &value) {
  return std::vector<T>(n, value);
}
template <class... Args> auto md_vec(const usize n, Args... args) {
  return std::vector<decltype(md_vec(args...))>(n, md_vec(args...));
}
template <class T> constexpr T difference(const T &a, const T &b) noexcept {
  return a < b ? b - a : a - b;
}
template <class T> void chmin(T &a, const T &b) noexcept {
  if (b < a)
    a = b;
}
template <class T> void chmax(T &a, const T &b) noexcept {
  if (a < b)
    a = b;
}
template <class F> class rec_lambda {
  F f;

public:
  rec_lambda(F &&f) : f(std::move(f)) {}
  template <class... Args> auto operator()(Args &&... args) const {
    return f(*this, std::forward<Args>(args)...);
  }
};
template <class F> auto make_rec(F &&f) { return rec_lambda<F>(std::move(f)); }
template <class T> T scan() {
  T ret;
  std::cin >> ret;
  return ret;
}
constexpr char eoln = '\n';
template <class T> T ceildiv(const T &l, const T &r) {
  return l / r + (l % r != 0 ? 1 : 0);
}

} // namespace n91

namespace ei1333 {
using namespace std;
template <typename T> struct edge {
  int src, to;
  T cost;

  edge(int to, T cost) : src(-1), to(to), cost(cost) {}

  edge(int src, int to, T cost) : src(src), to(to), cost(cost) {}

  edge &operator=(const int &x) {
    to = x;
    return *this;
  }

  operator int() const { return to; }
};

template <typename T> using Edges = vector<edge<T>>;
template <typename T> using WeightedGraph = vector<Edges<T>>;
using UnWeightedGraph = vector<vector<int>>;
template <typename T> using Matrix = vector<vector<T>>;
template <typename G> struct CentroidDecomposition {
  const G &g;
  vector<int> sub;
  vector<vector<int>> belong;
  vector<bool> v;

  CentroidDecomposition(const G &g)
      : g(g), sub(g.size()), v(g.size()), belong(g.size()) {}

  inline int build_dfs(int idx, int par) {
    sub[idx] = 1;
    for (auto &to : g[idx]) {
      if (to == par || v[to])
        continue;
      sub[idx] += build_dfs(to, idx);
    }
    return sub[idx];
  }

  inline int search_centroid(int idx, int par, const int mid) {
    for (auto &to : g[idx]) {
      if (to == par || v[to])
        continue;
      if (sub[to] > mid)
        return search_centroid(to, idx, mid);
    }
    return idx;
  }

  inline void belong_dfs(int idx, int par, int centroid) {
    belong[idx].emplace_back(centroid);
    for (auto &to : g[idx]) {
      if (to == par || v[to])
        continue;
      belong_dfs(to, idx, centroid);
    }
  }

  inline int build(UnWeightedGraph &t, int idx) {
    int centroid = search_centroid(idx, -1, build_dfs(idx, -1) / 2);
    v[centroid] = true;
    belong_dfs(centroid, -1, centroid);
    for (auto &to : g[centroid]) {
      if (!v[to])
        t[centroid].emplace_back(build(t, to));
    }
    v[centroid] = false;
    return centroid;
  }

  inline int build(UnWeightedGraph &t) {
    t.resize(g.size());
    return build(t, 0);
  }
};
} // namespace ei1333

#include <cassert>
#include <cstddef>
#include <memory>
#include <utility>
#include <vector>

template <class ValueMonoid, class OperatorMonoid, class Modifier>
class lazy_st_trees {
public:
  using value_structure = ValueMonoid;
  using value_type = typename value_structure::value_type;
  using operator_structure = OperatorMonoid;
  using operator_type = typename operator_structure::value_type;
  using modifier = Modifier;

private:
  class node_type {
  public:
    node_type *left, *right, *parent;
    typename lazy_st_trees::value_type value, sum;
    typename lazy_st_trees::operator_type lazy;
    bool reversed; // reverse->lazy
    node_type(node_type *const p)
        : left(p), right(p), parent(p), value(value_structure::identity()),
          sum(value_structure::identity()),
          lazy(operator_structure::identity()), reversed(0) {}
  };

  using container_type = ::std::vector<node_type>;

public:
  using size_type = typename container_type::size_type;

private:
  using pointer = node_type *;
  using const_pointer = const node_type *;

  static void reverse(const pointer ptr) {
    ptr->lazy = operator_structure::reverse(::std::move(ptr->lazy));
    ptr->reversed ^= 1;
  }
  static void push(const pointer ptr) {
    if (ptr->reversed) {
      ptr->reversed = 0;
      ptr->value = value_structure::reverse(::std::move(ptr->value));
      ::std::swap(ptr->left, ptr->right);
      reverse(ptr->left);
      reverse(ptr->right);
    }
    ptr->left->lazy = operator_structure::operation(ptr->left->lazy, ptr->lazy);
    ptr->right->lazy =
        operator_structure::operation(ptr->right->lazy, ptr->lazy);
    ptr->value = modifier::operation(ptr->value, ptr->lazy);
    ptr->lazy = operator_structure::identity();
  }
  void propagate(pointer ptr) {
    pointer prev = nullptr;
    while (ptr != nil()) {
      ::std::swap(ptr->parent, prev);
      ::std::swap(ptr, prev);
    }
    while (prev) {
      push(prev);
      ::std::swap(prev->parent, ptr);
      ::std::swap(prev, ptr);
    }
    nil()->sum = value_structure::identity();
    nil()->lazy = operator_structure::identity();
    nil()->reversed = 0;
  }
  static value_type reflect(const const_pointer ptr) {
    return modifier::operation(
        ptr->reversed ? value_structure::reverse(ptr->sum) : ptr->sum,
        ptr->lazy);
  }
  static void calc(const pointer ptr) {
    ptr->sum = value_structure::operation(
        value_structure::operation(reflect(ptr->left), ptr->value),
        reflect(ptr->right));
  }
  static void rotate_l(const pointer ptr, const pointer ch) {
    ptr->right = ch->left;
    ch->left->parent = ptr;
    calc(ptr);
    ch->left = ptr;
    ptr->parent = ch;
  }
  static void rotate_r(const pointer ptr, const pointer ch) {
    ptr->left = ch->right;
    ch->right->parent = ptr;
    calc(ptr);
    ch->right = ptr;
    ptr->parent = ch;
  }
  static void splay(const pointer ptr) {
    for (pointer x, y = ptr;;) {
      x = ptr->parent;
      if (x->left == y) {
        y = x->parent;
        ptr->parent = y->parent;
        if (y->left == x)
          rotate_r(y, x), rotate_r(x, ptr);
        else if (y->right == x)
          rotate_l(y, ptr), rotate_r(x, ptr);
        else
          return ptr->parent = y, rotate_r(x, ptr);
      } else if (x->right == y) {
        y = x->parent;
        ptr->parent = y->parent;
        if (y->right == x)
          rotate_l(y, x), rotate_l(x, ptr);
        else if (y->left == x)
          rotate_r(y, ptr), rotate_l(x, ptr);
        else
          return ptr->parent = y, rotate_l(x, ptr);
      } else {
        return;
      }
    }
  }
  void expose(const pointer ptr) {
    propagate(ptr);
    pointer x = ptr, prev = nil();
    while (x != nil()) {
      splay(x);
      x->right = prev;
      calc(x);
      prev = x;
      x = x->parent;
    }
    splay(ptr);
    calc(ptr);
  }
  void reroot(const pointer ptr) {
    expose(ptr);
    reverse(ptr);
  }

  container_type nodes;

  pointer get_ptr(const size_type v) { return nodes.data() + v; }
  pointer nil() { return &nodes.back(); }

public:
  lazy_st_trees() : nodes() {}
  explicit lazy_st_trees(const size_type size) : nodes() {
    nodes.reserve(size + 1);
    nodes.resize(size + 1, node_type(nodes.data() + size));
  }

  bool empty() const { return size() == 0; }
  size_type size() const { return nodes.size() - 1; }

  bool connected(const size_type v, const size_type u) {
    assert(v < size());
    assert(u < size());
    expose(get_ptr(v));
    expose(get_ptr(u));
    return nodes[v].parent != nil() || v == u;
  }
  value_type fold_path(const size_type v, const size_type u) {
    assert(v < size());
    assert(u < size());
    assert(connected(v, u));
    reroot(get_ptr(v));
    expose(get_ptr(u));
    return nodes[u].sum;
  }

  void reroot(const size_type v) {
    assert(v < size());
    reroot(get_ptr(v));
  }
  void link(const size_type parent, const size_type child) {
    assert(parent < size());
    assert(child < size());
    assert(!connected(parent, child));
    reroot(get_ptr(child));
    nodes[child].parent = get_ptr(parent);
  }
  void cut(const size_type v) {
    assert(v < size());
    expose(get_ptr(v));
    nodes[v].left->parent = nil();
    nodes[v].left = nil();
    nodes[v].sum = nodes[v].value;
  }
  void update_path(const size_type v, const size_type u,
                   const operator_type &value) {
    assert(v < size());
    assert(u < size());
    assert(connected(v, u));
    reroot(get_ptr(v));
    expose(get_ptr(u));
    nodes[u].lazy = value;
  }
  template <class F> void update_vertex(const size_type v, const F &f) {
    assert(v < size());
    expose(get_ptr(v));
    nodes[v].value = f(::std::move(nodes[v].value));
    calc(get_ptr(v));
  }
};

template <class T> class plus_monoid_2 {
public:
  using value_type = T;

  static constexpr T operation(const T &x, const T &y) noexcept {
    return x + y;
  }
  static constexpr T identity() noexcept { return 0; }
  static constexpr T reverse(const T &x) noexcept { return x; }
};

#include <tuple>

class trivial_group {
public:
  using value_type = std::tuple<>;
  static constexpr value_type operation(const value_type,
                                        const value_type) noexcept {
    return value_type();
  }
  static constexpr value_type identity() noexcept { return value_type(); }
  static constexpr value_type inverse(const value_type) noexcept {
    return value_type();
  }
  static constexpr value_type reverse(const value_type) noexcept {
    return value_type();
  }
};

template <class T> class trivial_action {
public:
  static constexpr T
  operation(const T &lhs, const typename trivial_group::value_type) noexcept {
    return lhs;
  }
};

namespace n91 {

template <class T> class plus_monoid {
public:
  using value_type = T;
  static T operation(const T l, const T r) { return l + r; }
  static constexpr T identity = 0;
};

#include <cassert>
#include <cstddef>
#include <vector>

template <class M> class fenwick_tree {
  using T = typename M::value_type;

public:
  using value_type = T;

private:
  std::vector<T> tree;

public:
  fenwick_tree() = default;

  explicit fenwick_tree(const usize size) : tree(size + 1, M::identity) {}

  bool empty() const { return size() == 0; }

  usize size() const { return tree.size() - 1; }

  T fold_prefix(usize last) const {
    assert(last <= size());
    T ret = M::identity;
    while (last != 0) {
      ret = M::operation(tree[last], ret);
      last &= last - 1;
    }
    return ret;
  }

  void add(usize index, const T value) {
    assert(index < size());
    index += 1;
    while (index < tree.size()) {
      tree[index] = M::operation(tree[index], value);
      index += index & ~index + 1;
    }
  }
};

void main_() {
  //*
  std::ios::sync_with_stdio(false);
  std::cin.tie(nullptr);
  //*/
  const usize n = scan<usize>();
  const usize q = scan<usize>();
  lazy_st_trees<plus_monoid_2<usize>, trivial_group, trivial_action<usize>> lst(
      n);
  ei1333::UnWeightedGraph g(n);
  for (const usize i : rep(0, n - 1)) {
    const usize a = scan<usize>() - 1;
    const usize b = scan<usize>() - 1;
    g[a].push_back(b);
    g[b].push_back(a);
    lst.link(a, b);
  }
  for (const usize i : rep(0, n)) {
    lst.update_vertex(i, [](auto) { return 1; });
  }
  ei1333::CentroidDecomposition<ei1333::UnWeightedGraph> cd(g);
  ei1333::UnWeightedGraph tree;
  usize root = cd.build(tree);

  std::vector<usize> par(n);
  make_rec([&](const auto &dfs, const usize v) -> void {
    for (const usize e : tree[v]) {
      par[e] = v;
      dfs(e);
    }
  })(root);
  const auto dist = [&](const usize x, const usize y) -> usize {
    return lst.fold_path(x, y) - 1;
  };
  std::vector<fenwick_tree<plus_monoid<u64>>> al(n), sub(n);
  make_rec([&](const auto &dfs, const usize v) -> usize {
    usize res = 1;
    for (const usize e : tree[v]) {
      res += dfs(e);
    }
    al[v] = fenwick_tree<plus_monoid<u64>>(res - 1 + 2);
    sub[v] = fenwick_tree<plus_monoid<u64>>(res - 1 + 3);
    return res;
  })(root);
  const auto sub_or = [&](auto &ft, const usize i, const u64 val) {
    ft.add(std::min(i, ft.size() - 1), -val);
  };
  for (const usize loop : rep(0, q)) {
    const usize x = scan<usize>() - 1;
    const usize y = scan<usize>();
    const u64 z = scan<u64>();
    {
      u64 ans = 0;
      ans += al[x].fold_prefix(1);
      usize xt = x;
      while (xt != root) {
        const usize pre = xt;
        xt = par[xt];
        const usize d = dist(x, xt);

        ans += al[xt].fold_prefix(d + 1);
        ans -= sub[pre].fold_prefix(d + 1);
      }
      std::cout << ans << eoln;
    }
    {
      al[x].add(0, z);
      sub_or(al[x], y + 1, z);
      usize xt = x;
      while (xt != root) {
        const usize pre = xt;
        xt = par[xt];
        const usize d = dist(x, xt);
        if (y < d)
          continue;

        al[xt].add(0, z);
        sub_or(al[xt], y - d + 1, z);
        sub[pre].add(0, z);
        sub_or(sub[pre], y - d + 1, z);
      }
    }
  }
}

} // namespace n91

int main() {
  n91::main_();
  return 0;
}