N,M,K=[int(i) for i in input().split()]
e=[];s=0
for j in range(M):
	a,b,c=[int(i) for i in input().split()]
	e.append((c,a,b))
	s+=c
o=sorted(e)
p={}; pn=0
l=[-1 for _ in range(N+1)]
for j in range(K):
	i=int(input())-1
	a,b=e[i][1:3]
	# x=-1;y=-1
	# for k,q in enumerate(p):
	# 	if a in q: x=k
	# 	if b in q: y=k
	# if x<0 and y<0: p.append({a,b})
	# elif x<0: p[y].add(a)
	# elif y<0: p[x].add(b)
	# elif x!=y: p[x]|=p[y]; del p[y]
	if l[a]<0 and l[b]<0: p[pn]={a,b}; l[a]=pn; l[b]=pn; pn+=1
	elif l[a]<0: p[l[b]].add(a); l[a]=l[b]
	elif l[b]<0: p[l[a]].add(b); l[b]=l[a]
	elif l[a]!=l[b]:
		t=l[b]
		p[l[a]]|=p[t]
		for i in p[t]:
			l[i]=l[a]
		del p[t]
	s-=e[i][0]
for f in o:
	a,b=f[1:3]
	# x=-1;y=-1
	# for k,q in enumerate(p):
	# 	if a in q: x=k
	# 	if b in q: y=k
	# if x<0 and y<0: p.append({a,b})
	# elif x<0: p[y].add(a)
	# elif y<0: p[x].add(b)
	# elif x!=y: p[x]|=p[y]; del p[y]
	if l[a]<0 and l[b]<0: p[pn]={a,b}; l[a]=pn; l[b]=pn; pn+=1
	elif l[a]<0: p[l[b]].add(a); l[a]=l[b]
	elif l[b]<0: p[l[a]].add(b); l[b]=l[a]
	elif l[a]!=l[b]:
		t=l[b]
		p[l[a]]|=p[t]
		for i in p[t]:
			l[i]=l[a]
		del p[t]
	else: continue
	s-=f[0]
print(s)