N,M,K=[int(i) for i in input().split()]
e=[];t=set();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=[]
for j in range(K):
	i=int(input())-1
	t.add(i)
	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]
	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]
	else: continue
	s-=f[0]
print(s)