#include<bits/stdc++.h>
using namespace std;
#ifdef ONPC
#include"debug.h"
#else
#define debug(...) 42
#endif
#define endl '\n'
#define ll long long
#define pii pair<int,int>
#define F first
#define S second
#define pb push_back
#define sz(a) (int)a.size()
#define all(a) a.begin(),a.end()
#define int long long
template<class T> bool ckmin(T& a, const T& b) { return b < a ? a = b, 1 : 0; }
template<class T> bool ckmax(T& a, const T& b) { return a < b ? a = b, 1 : 0; }
const int mod = 1e9 + 7;
const int MAXN = 1e6 + 15;
const int inf = 0x3f3f3f3f;
const ll INF = 0x3f3f3f3f3f3f3f3f;
vector<int> adj[MAXN];
int fa[MAXN][20], dep[MAXN], dt[MAXN], ft[MAXN], timer = 1;
void dfs(int node, int par){
dep[node] = dep[par] + 1;
fa[node][0] = par;
dt[node] = timer++;
for (auto to : adj[node]){
if (to != par) dfs(to, node);
}
ft[node] = timer++;
}
int lca(int u, int v){
if (dep[u] > dep[v]) swap(u, v);
for (int j = 19; j >= 0; j--){
if (dep[fa[v][j]] >= dep[u]) v = fa[v][j];
}
if (u == v) return u;
for (int j = 19; j >= 0; j--){
if (fa[v][j] != fa[u][j]) v = fa[v][j], u = fa[u][j];
}
return fa[u][0];
}
vector<array<int, 3>> queries[MAXN];
ll dp[MAXN];
bool contain(int u, int v){
return dt[u] <= dt[v] && ft[v] <= ft[u];
}
void solve(int node, int par){
for (int to : adj[node]){
if (to != par) {
solve(to, node);
dp[node] += dp[to];
}
}
for (auto [u, v, c] : queries[node]){
ll tm = c;
for (int to : adj[u]){
if (contain(to, v) || contain(to, u)) continue;
tm += dp[to];
}
for (int to : adj[v]){
if (contain(to, v) || contain(to, u)) continue;
tm += dp[to];
}
if (node != u && node != v){
for (int to : adj[node]){
if (contain(to, v) || contain(to, u)) continue;
tm += dp[to];
}
}
ckmax(dp[node], tm);
}
}
int32_t main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
int n;
cin >> n;
for (int i = 0; i < n - 1; i++){
int u, v;
cin >> u >> v;
adj[u].pb(v);
adj[v].pb(u);
}
dfs(1, 1);
for (int j = 1; j < 20; j++){
for (int i = 1; i <= n; i++){
fa[i][j] = fa[fa[i][j - 1]][j - 1];
}
}
int m;
cin >> m;
for (int i = 0; i < m; i++){
int u, v, c;
cin >> u >> v >> c;
queries[lca(u, v)].pb({u, v, c});
}
solve(1, 1);
cout << dp[1] << endl;
}
