#include <bits/stdc++.h>
#define int int64_t
const int N = 1e5 + 5;
struct Lca{
std::vector<int>adj[N];
int in[N];
int out[N];
int timer=1;
int P[N];
int Log(int n){
int logs[n+1];
logs[1]=0;
for(int i=2;i<=n;i++)logs[i]=logs[i/2]+1;
return logs[n];
}
int up[N][30];
void build(int n){
up[1][0]=1;
for(int i=2;i<=n;i++)up[i][0]=P[i];
for(int i=1;i<=29;i++){
for(int j=1;j<=n;j++){
up[j][i]=up[up[j][i-1]][i-1];
}
}
}
void connect(int u,int v){
adj[u].push_back(v);
adj[v].push_back(u);
}
void dfs(int x,int father){
in[x]=timer++;
P[x]=father;
for(auto it:adj[x]){
if(it!=father)dfs(it,x);
}
out[x]=timer;
}
int in_tree(int u,int v){
return in[u]<=in[v]&&out[u]>=out[v];
}
int lca(int u,int v){
if(u==v)return u;
if(in_tree(u,v))return u;
if(in_tree(v,u))return v;
for(int i=29;i>=0;i--){
if(!in_tree(up[u][i],v)){
u=up[u][i];
}
}
return up[u][0];
}
}lca;
void solve() {
int n;
std::cin >> n;
std::vector<std::vector<int>> g(n + 1);
for(int i = 1; i < n; i++) {
int u, v;
std::cin >> u >> v;
g[u].push_back(v);
g[v].push_back(u);
lca.connect(u, v);
}
lca.dfs(1, 0);
lca.build(n);
std::vector<int> dp(n + 1, 0);
std::vector<std::array<int, 3>> ty[n + 1];
int q;
std::cin >> q;
while(q--) {
int u, v, w;
std::cin >> u >> v >> w;
ty[lca.lca(u, v)].push_back({u, v, w});
}
std::vector<int> s(n + 1);
std::function<int(int, int)> Df = [&] (int u, int v) {
int ath = lca.lca(u, v);
int sum = 0;
while(u != ath) {
for(auto a : g[u]) {
if(a == lca.P[u]) {
continue;
}
sum += dp[a];
}
sum -= dp[u];
u = lca.P[u];
}
while(v != ath) {
for(auto a : g[v]) {
if(a == lca.P[v]) {
continue;
}
sum += dp[a];
}
sum -= dp[v];
v = lca.P[v];
}
for(auto a : g[ath]) {
if(a == lca.P[ath]) {
continue;
}
sum += dp[a];
}
return sum;
};
std::function<void(int, int)> dfs = [&] (int v, int p) {
for(auto u : g[v]) {
if(u == p) {
continue;
}
dfs(u, v);
}
for(auto ath : g[v]) {
if(ath == p) {
continue;
}
dp[v] += dp[ath];
}
for(auto [l, r, d] : ty[v]) {
dp[v] = std::max(dp[v], Df(l, r) + d);
}
};
dfs(1, 0);
std::cout << dp[1];
}
signed main() {
std::ios::sync_with_stdio(false);
std::cin.tie(nullptr);
int t = 1;
//std::cin >> t;
while (t--) {
solve();
}
return 0;
}
