#include<bits/stdc++.h>
using namespace std;
#define int long long
#define ii pair <int, int>
#define app push_back
#define all(a) a.begin(), a.end()
#define bp __builtin_popcount
#define ll long long
#define mp make_pair
#define f first
#define s second
#define Time (double)clock()/CLOCKS_PER_SEC
const int N = 1e5 + 7, LG = 20;
vector <int> g[N];
vector <int> mem[N];
int to[N][LG];
int tin[N], tout[N], timer = 0;
int in = 0, out = 0, in_pos[N], out_pos[N], r[N];
void dfs(int u, int p) {
to[u][0] = p;
for (int i = 1; i < LG; ++i)
to[u][i] = to[to[u][i - 1]][i - 1];
r[u] = out - 1;
tin[u] = timer++;
in_pos[u] = in++;
for (int v : g[u])
if (v != p)
dfs(v, u);
tout[u] = timer++;
out_pos[u] = out++;
}
bool anc(int u, int v) {
return tin[u] <= tin[v] && tout[v] <= tout[u];
}
int lca(int u, int v) {
if (anc(u, v))
return u;
for (int i = LG - 1; i >= 0; --i)
if (!anc(to[u][i], v))
u = to[u][i];
return to[u][0];
}
int dp[N];
struct Quer {
int u, v, c;
} d[N];
void add(int i, int x, int *f) {
for (; i < N; i |= i + 1)
f[i] += x;
}
int get(int i, int *f) {
int ans = 0;
for (; i >= 0; i &= i + 1, --i)
ans += f[i];
return ans;
}
int get(int l, int r, int *f) {
return get(r, f) - get(l - 1, f);
}
int in_f[N], out_f[N];
int get(int u) {
return get(in_pos[u], in_f) - get(r[u], out_f);
}
int get(int u, int p) {
return get(u) - get(p);
}
void solve(int u, int p) {
int sum = 0;
for (int v : g[u])
if (v != p) {
solve(v, u);
dp[u] += dp[v];
sum += dp[v];
}
for (int i : mem[u])
dp[u] = max(dp[u], get(d[i].u, u) + get(d[i].v, u) + sum + d[i].c);
sum -= dp[u];
add(in_pos[u], sum, in_f);
add(out_pos[u], sum, out_f);
}
signed main() {
#ifdef HOME
freopen("input.txt", "r", stdin);
#else
ios_base::sync_with_stdio(0); cin.tie(0);
#endif
int n;
cin >> n;
for (int i = 0; i < n - 1; ++i) {
int u, v;
cin >> u >> v;
g[u].app(v); g[v].app(u);
}
dfs(1, 1);
int m;
cin >> m;
for (int i = 0; i < m; ++i) {
cin >> d[i].u >> d[i].v >> d[i].c;
mem[lca(d[i].u, d[i].v)].app(i);
}
solve(1, 1);
#ifdef HOME
for (int i = 1; i <= n; ++i)
cout << dp[i] << ' ';
cout << '\n';
#endif
cout << dp[1] << '\n';
}
