#include <bits/stdc++.h>
using namespace std;
#define OPENIOBUF

namespace FastIO
{

class FastIOBase
{
 protected:
#ifdef OPENIOBUF
	static const int BUFSIZE=1<<16;
	char buf[BUFSIZE+1];
	int buf_p=0;
#endif
	FILE *target;
	FastIOBase(FILE *f): target(f){}
	~FastIOBase()=default;
 public:
#ifdef OPENIOBUF
	virtual void flush()=0;
#endif
};

class FastOutput final: public FastIOBase
{
 private:
	void __putc(char x)
	{
#ifdef OPENIOBUF
		if(buf[buf_p++]=x,buf_p==BUFSIZE) flush();
#else
		putc(x,target);
#endif
	}
	template<typename T>
	void __write(T x)
	{
		char stk[64],*top=stk;
		if(x<0) return __putc('-'),__write(-x);
		do *(top++)=x%10,x/=10; while(x);
		for(;top!=stk;__putc(*(--top)+'0'));
	}
 public:
	FastOutput(FILE *f=stdout): FastIOBase(f) {}
#ifdef OPENIOBUF
	~FastOutput() { flush(); }
	void flush() { fwrite(buf,1,buf_p,target),buf_p=0; }
#endif
	FastOutput &operator <<(char x)
	{ return __putc(x),*this; }
	FastOutput &operator <<(const char *s)
	{ for(;*s;__putc(*(s++)));return *this; }
	FastOutput &operator <<(const string &s)
	{ return (*this)<<s.c_str(); }
	template<typename T>
	enable_if_t<is_integral<T>::value,FastOutput&> operator <<(const T &x)
	{ return __write(x),*this; }
	template<typename ...T>
	void writesp(const T &...x)
	{ initializer_list<int>{(this->operator<<(x),__putc(' '),0)...}; }
	template<typename ...T>
	void writeln(const T &...x)
	{ initializer_list<int>{(this->operator<<(x),__putc('\n'),0)...}; }
	template<typename Iter>
	void writesp(Iter begin,Iter end)
	{ while(begin!=end) (*this)<<*(begin++)<<' '; }
	template<typename Iter>
	void writeln(Iter begin,Iter end)
	{ while(begin!=end) (*this)<<*(begin++)<<'\n'; }
}qout;

class FastInput final: public FastIOBase
{
 private:
	bool __eof;
 public:
	FastInput(FILE *f=stdin): FastIOBase(f),__eof(false)
#ifdef OPENIOBUF
	{ buf_p=BUFSIZE; }
	void flush() { buf[fread(buf,1,BUFSIZE,target)]=EOF,buf_p=0; }
	bool eof()const { return buf[buf_p]==EOF; }
#else
	{}
	bool eof()const { return feof(target); }
#endif
	char get()
	{
		if(__eof) return EOF;
#ifdef OPENIOBUF
		if(buf_p==BUFSIZE) flush();
		char ch=buf[buf_p++];
#else
		char ch=getc(target);
#endif
		return ~ch?ch:(__eof=true,EOF);
	}
	void unget(char c)
	{
		__eof=false;
#ifdef OPENIOBUF
		buf_p--;
#else
		ungetc(c,target);
#endif
	}
	explicit operator bool()const { return !__eof; }
	FastInput &operator >>(char &x)
	{ while(isspace(x=get()));return *this; }
	template<typename T>
	enable_if_t<is_integral<T>::value,FastInput&> operator >>(T &x)
	{
		char ch,sym=0;x=0;
		while(isspace(ch=get()));
		if(__eof) return *this;
		if(ch=='-') sym=1,ch=get();
		for(x=0;isdigit(ch);x=(x<<1)+(x<<3)+(ch^48),ch=get());
		return unget(ch),sym?x=-x:x,*this;
	}
	FastInput &operator >>(char *s)
	{
		while(isspace(*s=get()));
		if(__eof) return *this;
		for(;!isspace(*s) && !__eof;*(++s)=get());
		return unget(*s),*s='\0',*this;
	}
	FastInput &operator >>(string &s)
	{
		char str_buf[(1<<8)+1]={0},*p=str_buf;
		char *const buf_end=str_buf+(1<<8);
		while(isspace(*p=get()));
		if(__eof) return *this;
		for(s.clear(),p++;;p=str_buf)
		{
			for(;p!=buf_end && !isspace(*p=get()) && !__eof;p++);
			if(p!=buf_end) break;
			s.append(str_buf);
		}
		unget(*p),*p='\0',s.append(str_buf);
		return *this;
	}
	template<typename ...T>
	void read(T &...x)
	{ initializer_list<int>{(this->operator>>(x),0)...}; }
	template<typename Iter>
	void read(Iter begin,Iter end)
	{ while(begin!=end) (*this)>>*(begin++); }
}qin;

} // namespace FastIO
using FastIO::qin,FastIO::qout;

using LL=long long;
using LD=long double;
using UI=unsigned int;
using ULL=unsigned long long;

#ifndef DADALZY
#define FILEIO(file) freopen(file".in","r",stdin),freopen(file".out","w",stdout)
#define LOG(...) void()
#else
#define FILEIO(file)
#define LOG(...) fprintf(stderr,__VA_ARGS__)
#endif

int n,m,K;
vector<int> g[100005];
vector<tuple<int,int,int>> ask[100005];

int siz[100005],dep[100005],son[100005],anc[100005],top[100005];
int tot,lb[100005],rb[100005],pos[100005];
void dfs1(int u,int fa=0)
{
	siz[u]=1,anc[u]=fa,dep[u]=dep[fa]+1;
	int cur=0;
	for(auto &v: g[u])
	{
		if(v==fa) continue;
		pos[v]=cur++;
		dfs1(v,u),siz[u]=siz[v]+1;
		if(siz[v]>siz[son[u]]) son[u]=v;
	}
}
void dfs2(int u,int tp,int fa=0)
{
	lb[u]=++tot,top[u]=tp;
	if(son[u]) dfs2(son[u],tp,u);
	for(auto &v: g[u])
		if(v!=fa && v!=son[u])
			dfs2(v,v,u);
	rb[u]=tot;
}

class FenwickTree
{
 private:
	LL t[100005];
 public:
	void add(int p,LL x) { for(;p<=n;t[p]+=x,p+=p&-p); }
	LL get(int p) { LL x=0;for(;p;x+=t[p],p-=p&-p);return x; }
	LL get(int l,int r) { return l>r?0:get(r)-get(l-1); }
}t;

LL dp[100005][12],all[100005],tmp[1<<12];
inline int lca(int u,int v)
{
	int fu=top[u],fv=top[v];
	while(fu!=fv)
		if(dep[fu]>dep[fv]) u=anc[fu],fu=top[u];
		else v=anc[fv],fv=top[v];
	return dep[u]<dep[v]?u:v;
}
inline int jump(int u,int v)
{
	int fv=top[v];
	while(dep[fv]>dep[u]+1)
		v=anc[fv],fv=top[v];
	if(dep[fv]==dep[u]+1) return fv;
	return son[u];
}
inline LL getsum(int u,int v)
{
	int fu=top[u],fv=top[v];
	LL res=all[v]-dp[v][pos[son[v]]];
	while(fu!=fv)
	{
		res+=t.get(lb[fv],lb[v]);
		int w=anc[fv];
		res+=dp[w][pos[v]]-dp[w][pos[son[w]]];
		v=w,fv=top[v];
	}
	res+=t.get(lb[u],lb[v]);
	return res;
}
void dfs3(int u,int fa=0)
{
	for(auto &v: g[u]) if(v!=fa) dfs3(v,u);
	int sz=g[u].size()-!!fa,M=(1<<sz);
	fill(tmp,tmp+M,0);
	for(auto &[x,y,w]: ask[u])
	{
		int msk=0,vx=0,vy=0;
		if(x!=u) vx=jump(u,x),w+=getsum(vx,x),msk|=(1<<pos[vx]);
		if(y!=u) vy=jump(u,y),w+=getsum(vy,y),msk|=(1<<pos[vy]);
		int lim=(M-1)^msk;
		for(int S=lim;S;S=(S-1)&lim)
			tmp[S|msk]=max(tmp[S|msk],tmp[S]+w);
		tmp[msk]=max(tmp[msk],tmp[0]+w);
	}
	for(int i=0;i<sz;i++) dp[u][i]=tmp[(M-1)^(1<<i)];
	all[u]=tmp[M-1];
	t.add(lb[u],dp[u][pos[son[u]]]);
}

int main()
{
	qin>>n>>m>>K;
	for(int i=1,u,v;i<n;i++)
	{
		qin>>u>>v;
		g[u].push_back(v);
		g[v].push_back(u);
	}
	dfs1(1),dfs2(1,1);
	for(int i=1,u,v,w;i<=m;i++)
	{
		qin>>u>>v>>w;
		int l=lca(u,v);
		ask[l].emplace_back(u,v,w);
	}
	dfs3(1);
	qout<<all[1]<<'\n';
	return 0;
}