#include <cstdio>
#include <cstring>
#include <vector>

#define PB push_back

using namespace std;

typedef long long ll;

const int N = 1e5 + 500;
const int M = 5e5 + 500;
const int LOG = 17;
const int OFF = (1 << LOG);
const int MSK = (1 << 12);

vector < int > v[N], ch[N], sada[N];
int par[N][LOG], L[N], R[N], dep[N], tme;
int lc[M], a[M], b[M], ozn[N], w[M];
ll T[2 * OFF];
int n, m;

void dfs(int x, int lst){
	dep[x] = dep[lst] + 1; par[x][0] = lst;
	L[x] = tme++;
	for(int y : v[x])
		if(y != lst) dfs(y, x), ch[x].PB(y);
	R[x] = tme - 1;
}

void prepare_lca(){
	for(int j = 1;j < LOG;j++)
		for(int i = 1;i <= n;i++)
			par[i][j] = par[par[i][j - 1]][j - 1];
}

void update(int i, int a, int b, int lo, int hi, ll x) {
	if(lo <= a && b <= hi) {
		T[i] += x; return;
	}
	if(a > hi || b < lo) return;
	update(2 * i, a, (a + b) / 2, lo, hi, x);
	update(2 * i + 1, (a + b) / 2 + 1, b, lo, hi, x);
}

ll query(int i) {
	ll ret = 0;
	for(i += OFF; i ; i /= 2)
		ret += T[i];
	return ret;
}

ll dp[MSK], slob[MSK];

void ubaci(int msk, int tko, ll sto) {
	msk -= tko;
	for(int st = msk; st ; st = (st - 1) & msk)
		dp[st + tko] = max(dp[st + tko], dp[st] + sto);
	dp[tko] = max(dp[tko], sto);
}

int digni(int x, int k) {
	for(int i = 0;i < LOG;i++)
		if(k & (1 << i)) x = par[x][i];
	return x;
}

int lca(int x, int y) {
	y = digni(y, dep[y] - dep[x]);
	if(x == y) return x;
	for(int i = LOG - 1;i >= 0;i--)
		if(par[x][i] != par[y][i])
			x = par[x][i], y = par[y][i];
	return par[x][0];
}

void solve(int x) {
	for(int y : ch[x]) solve(y);
	for(int i = 0;i < (int)ch[x].size();i++)
		ozn[ch[x][i]] = i;
	int sz = (int)ch[x].size();
	for(int i = 0;i < (1 << sz);i++) {
		dp[i] = 0;
		for(int j = 0;j < sz;j++) 
			if(i & (1 << j)) dp[i] += slob[ch[x][j]];
	}
	int ss = (1 << sz) - 1;
	for(int t : sada[x]) {
		if(a[t] == x) {
			int pb = digni(b[t], dep[b[t]] - dep[x] - 1);
			ubaci(ss, 1 << ozn[pb], query(L[pb]) + w[t]);
		} else {
			int pa = digni(a[t], dep[a[t]] - dep[x] - 1);
			int pb = digni(b[t], dep[b[t]] - dep[x] - 1);
			ubaci(ss, (1 << ozn[pb]) + (1 << ozn[pa]), query(L[pa]) + query(L[pb]) + w[t]);
		}
	}
	slob[x] = dp[ss];
	update(1, 0, OFF - 1, L[x], L[x], slob[x]);
	for(int y : ch[x]) {
		ll bez = dp[ss - (1 << ozn[y])];
		update(1, 0, OFF - 1, L[y], R[y], bez);
	}
}

int main(){ int kurac;
	scanf("%d%d%d", &n, &m, &kurac);
	for(int i = 1;i < n;i++) {
		int x, y; scanf("%d%d", &x, &y);
		v[x].PB(y), v[y].PB(x);
	}
	dfs(1, 1); 	
	prepare_lca();
	for(int i = 0;i < m;i++) {
		scanf("%d%d%d", a + i, b + i, w + i);
		if(dep[a[i]] > dep[b[i]]) swap(a[i], b[i]);
		sada[lca(a[i], b[i])].PB(i);
	}
	solve(1);
	printf("%lld\n", slob[1]);
	return 0;
}