/*
author: Maksim1744
created: 14.04.2021 11:51:00
*/
#include "bits/stdc++.h"
using namespace std;
using ll = long long;
using ld = long double;
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define sum(a) ( accumulate ((a).begin(), (a).end(), 0ll))
#define mine(a) (*min_element((a).begin(), (a).end()))
#define maxe(a) (*max_element((a).begin(), (a).end()))
#define mini(a) ( min_element((a).begin(), (a).end()) - (a).begin())
#define maxi(a) ( max_element((a).begin(), (a).end()) - (a).begin())
#define lowb(a, x) ( lower_bound((a).begin(), (a).end(), (x)) - (a).begin())
#define uppb(a, x) ( upper_bound((a).begin(), (a).end(), (x)) - (a).begin())
template<typename T> vector<T>& operator-- (vector<T> &v){for (auto& i : v) --i; return v;}
template<typename T> vector<T>& operator++ (vector<T> &v){for (auto& i : v) ++i; return v;}
template<typename T> istream& operator>>(istream& is, vector<T> &v){for (auto& i : v) is >> i; return is;}
template<typename T> ostream& operator<<(ostream& os, vector<T> v){for (auto& i : v) os << i << ' '; return os;}
template<typename T, typename U> pair<T,U>& operator-- (pair<T, U> &p){--p.first; --p.second; return p;}
template<typename T, typename U> pair<T,U>& operator++ (pair<T, U> &p){++p.first; ++p.second; return p;}
template<typename T, typename U> istream& operator>>(istream& is, pair<T, U> &p){is >> p.first >> p.second; return is;}
template<typename T, typename U> ostream& operator<<(ostream& os, pair<T, U> p){os << p.first << ' ' << p.second; return os;}
template<typename T, typename U> pair<T,U> operator-(pair<T,U> a, pair<T,U> b){return mp(a.first-b.first, a.second-b.second);}
template<typename T, typename U> pair<T,U> operator+(pair<T,U> a, pair<T,U> b){return mp(a.first+b.first, a.second+b.second);}
template<typename T, typename U> void umin(T& a, U b){if (a > b) a = b;}
template<typename T, typename U> void umax(T& a, U b){if (a < b) a = b;}
#ifdef HOME
#define SHOW_COLORS
#include "C:/C++ libs/print.cpp"
#else
#define show(...) 42
#define mclock 42
#define shows 42
#define debug if (false)
#endif
vector<int> lca_ind;
vector<vector<int>> lca_sparse;
vector<int> lca_p2;
vector<int> lca_depth;
void build_lca_sparse(vector<vector<int>>& g, int root = 0) {
int n = g.size();
vector<int> euler;
lca_ind.resize(n);
lca_depth.assign(n, -1);
function<void(int, int)> dfs = [&](int v, int depth) {
lca_ind[v] = euler.size();
euler.pb(v);
lca_depth[v] = depth;
for (auto k : g[v]) {
if (lca_depth[k] == -1) {
dfs(k, depth + 1);
euler.pb(v);
}
}
};
dfs(root, 0);
int m = euler.size();
int log = 1;
while ((1 << log) < m)
++log;
lca_sparse.resize(log);
lca_sparse[0].resize(m);
lca_p2.resize(m + 1);
int pp2 = 0;
for (int i = 1; i < lca_p2.size(); ++i) {
if (1 << (pp2 + 1) <= i)
++pp2;
lca_p2[i] = pp2;
}
lca_p2[0] = 0;
for (int i = 0; i < m; ++i)
lca_sparse[0][i] = euler[i];
for (int i = 1; i < log; ++i) {
lca_sparse[i].assign(m, 0);
for (int j = 0; j < m - (1 << (i - 1)); ++j) {
int v1 = lca_sparse[i - 1][j], v2 = lca_sparse[i - 1][j + (1 << (i - 1))];
if (lca_depth[v1] < lca_depth[v2])
lca_sparse[i][j] = v1;
else
lca_sparse[i][j] = v2;
}
}
}
int get_lca(int u, int v) {
if (u == v)
return u;
u = lca_ind[u];
v = lca_ind[v];
if (u > v)
swap(u, v);
int v1 = lca_sparse[lca_p2[v - u + 1]][u], v2 = lca_sparse[lca_p2[v - u + 1]][v - (1 << lca_p2[v - u + 1]) + 1];
if (lca_depth[v1] < lca_depth[v2])
return v1;
else
return v2;
}
int dist(int u, int v) {
return lca_depth[u] + lca_depth[v] - 2 * lca_depth[get_lca(u, v)];
}
struct item {
int sm = 0;
int md = 0;
template<typename T>
void init(const T &t, int l, int r) {
sm = t;
md = 0;
}
void update(const item &first, const item &second, int l, int r) {
sm = first.sm + second.sm;
}
static item merge(const item &first, const item &second, int l, int r) {
item res;
res.update(first, second, l, r); // careful with different lengths
return res;
}
template<typename Modifier>
void modify(const Modifier &m, int l, int r) {
// apply here, save for children
md += m;
sm += m * (r - l + 1);
}
void push(item &first, item &second, int l, int r) {
int m = (l + r) / 2;
first.modify(md, l, m);
second.modify(md, m + 1, r);
// reset modifier
md = 0;
}
};
string to_string(const item &i) {
stringstream ss;
ss << "[" << "]";
return ss.str();
}
ostream& operator << (ostream &o, const item &i) {
return o << to_string(i);
}
struct segtree {
vector<item> tree;
int n = 1;
segtree(int n = 1) : n(n) {
tree.resize(1 << (__lg(n - 1) + 2));
}
template<typename T>
void build(const vector<T> &v, int i, int l, int r) {
if (l == r) {
tree[i].init(v[l], l, r);
return;
}
int m = (l + r) >> 1;
build(v, i * 2 + 1, l, m);
build(v, i * 2 + 2, m + 1, r);
tree[i].update(tree[i * 2 + 1], tree[i * 2 + 2], l, r);
}
template<typename T>
void build(const vector<T> &v) {
n = v.size();
tree.resize(1 << (__lg(n - 1) + 2));
build(v, 0, 0, n - 1);
}
item ask(int l, int r, int i, int vl, int vr) {
if (vl != vr) {
tree[i].push(tree[i * 2 + 1], tree[i * 2 + 2], vl, vr);
}
if (l == vl && r == vr) {
return tree[i];
}
int m = (vl + vr) >> 1;
if (r <= m) {
return ask(l, r, i * 2 + 1, vl, m);
} else if (m < l) {
return ask(l, r, i * 2 + 2, m + 1, vr);
} else {
return item::merge(ask(l, m, i * 2 + 1, vl, m), ask(m + 1, r, i * 2 + 2, m + 1, vr), l, r);
}
}
item ask(int l, int r) {
l = max(l, 0); r = min(r, n - 1);
if (l > r) return item();
return ask(l, r, 0, 0, n - 1);
}
template<typename T>
void set(int ind, const T &t) {
static array<pair<int, int>, 30> st;
int l = 0, r = n - 1, i = 0;
int ptr = -1;
while (l != r) {
if (l != r) {
tree[i].push(tree[i * 2 + 1], tree[i * 2 + 2], l, r);
}
st[++ptr] = {l, r};
int m = (l + r) >> 1;
if (ind <= m) {
i = i * 2 + 1;
r = m;
} else {
i = i * 2 + 2;
l = m + 1;
}
}
tree[i].init(t, l, r);
while (i != 0) {
i = (i - 1) / 2;
tree[i].update(tree[i * 2 + 1], tree[i * 2 + 2], st[ptr].first, st[ptr].second);
--ptr;
}
}
template<typename Modifier>
void modify(int l, int r, const Modifier &modifier, int i, int vl, int vr) {
if (vl != vr) {
tree[i].push(tree[i * 2 + 1], tree[i * 2 + 2], vl, vr);
}
if (l == vl && r == vr) {
tree[i].modify(modifier, vl, vr);
return;
}
int m = (vl + vr) >> 1;
if (r <= m) {
modify(l, r, modifier, i * 2 + 1, vl, m);
} else if (m < l) {
modify(l, r, modifier, i * 2 + 2, m + 1, vr);
} else {
modify(l, m, modifier, i * 2 + 1, vl, m);
modify(m + 1, r, modifier, i * 2 + 2, m + 1, vr);
}
tree[i].update(tree[i * 2 + 1], tree[i * 2 + 2], vl, vr);
}
template<typename Modifier>
void modify(int l, int r, const Modifier &modifier) {
l = max(l, 0); r = min(r, n - 1);
if (l > r) return;
modify(l, r, modifier, 0, 0, n - 1);
}
};
int main() {
ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
int n;
cin >> n;
vector<vector<int>> g(n);
for (int i = 0; i < n - 1; ++i) {
int u, v;
cin >> u >> v;
--u; --v;
g[u].push_back(v);
g[v].push_back(u);
}
build_lca_sparse(g, 0);
int m;
cin >> m;
vector<vector<pair<pair<int, int>, int>>> here(n);
for (int i = 0; i < m; ++i) {
int a, b, c;
cin >> a >> b >> c;
--a; --b;
here[get_lca(a, b)].eb(mp(a, b), c);
}
vector<int> dp(n, 0);
vector<bool> u(n, false);
vector<int> L(n), R(n), ind(n);
vector<int> lvl(n, 0);
segtree tree(n);
int icur = 0;
vector<vector<int>> up(20, vector<int>(n, -1));
{
vector<bool> u(n, false);
function<void(int)> dfs1 = [&](int v) {
u[v] = true;
for (int k : g[v]) {
if (!u[k]) {
up[0][k] = v;
dfs1(k);
}
}
};
dfs1(0);
for (int i = 1; i < up.size(); ++i)
for (int j = 0; j < n; ++j)
if (up[i - 1][j] != -1)
up[i][j] = up[i - 1][up[i - 1][j]];
}
auto go_up = [&](int v, int k) {
for (int i = 0; i < up.size(); ++i)
if ((k >> i) & 1)
v = up[i][v];
return v;
};
function<void(int)> dfs = [&](int v) {
u[v] = true;
ind[v] = icur;
++icur;
L[v] = R[v] = ind[v];
int dp0 = 0;
vector<int> ch;
for (int k : g[v]) {
if (!u[k]) {
ch.pb(k);
lvl[k] = lvl[v] + 1;
dfs(k);
L[v] = min(L[v], L[k]);
R[v] = min(R[v], R[k]);
dp0 += dp[k];
}
}
dp[v] = dp0;
for (auto [ab, c] : here[v]) {
auto [a, b] = ab;
int cur = dp0;
for (int ch : vector<int>{a, b}) {
if (ch != v) {
cur -= dp[go_up(ch, lvl[ch] - lvl[v] - 1)];
cur += tree.ask(ind[ch], ind[ch]).sm;
}
}
dp[v] = max(dp[v], cur + c);
}
for (int k : ch) {
tree.modify(L[k], R[k], dp0 - dp[k]);
}
tree.set(ind[v], dp0);
};
dfs(0);
cout << dp[0] << '\n';
return 0;
}
