#include <bits/stdc++.h>
#define N 100005
using namespace std;
#define ll long long
#define ff first
#define ss second
ll bit[N];
ll get(int v){
ll s = 0;
while(v){
s += bit[v];
v -= v & -v;
}
return s;
}
void update(int x, ll v){
while(x < N){
bit[x] += v;
x += x & -x;
}
}
vector<int> adj[N];
int in[N], out[N], p[N][20];
int d[N];
int n;
int cnt;
void dfs2(int v, int par){
in[v] = ++cnt;
d[v] = d[par] + 1;
p[v][0] = par;
for(int i = 0; p[v][i] != 0; i++){
p[v][i + 1] = p[p[v][i]][i];
}
for(int& x : adj[v]){
if(x == par) continue;
dfs2(x, v);
}
out[v] = cnt;
}
int find(int v, int u){
if(d[v] < d[u]) swap(v, u);
for(int i = 0; d[v] - d[u]; i++)
if((d[v] - d[u]) & (1 << i))
v = p[v][i];
if(v == u) return v;
for(int i = 18; i >= 0; i--){
if(p[v][i] != p[u][i]){
v = p[v][i];
u = p[u][i];
}
}
return p[v][0];
}
vector<pair<pair<int, int>, int> > obj[N];
ll is1[N], is0[N];
void dfs(int v, int p){
ll res = 0;
for(int& x : adj[v]){
if(x == p) continue;
dfs(x, v);
res += is1[x];
}
is1[v] = is0[v] = res;
for(auto& x : obj[v])
is1[v] = max(is1[v], res + x.ss + get(in[x.ff.ff]) + get(in[x.ff.ss]));
update(in[v], res - is1[v]);
update(out[v] + 1, is1[v] - res);
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>n;
for(int v, u, i = 1; i < n; i++){
cin>>v>>u;
adj[v].push_back(u);
adj[u].push_back(v);
}
dfs2(1, 0);
cin>>n;
while(n--){
int a, b, c;
cin>>a>>b>>c;
obj[find(a, b)].push_back({{a, b}, c});
}
dfs(1, 0);
cout<<is1[1];
}
