N, M, K = map(int, input().split())
Root = [n for n in range(N)]
Children = [{n} for n in range(N)]
edges = [None for _ in range(M)]
for m in range(M):
	a, b, c = map(int, input().split())
	edges[m] = (a-1, b-1, c)
abs_edges = set(int(input())-1 for _ in range(K))
sorted_edges = sorted([e for e in set(range(M)) - abs_edges], key=lambda x: edges[x][2])

# 最小木
T = {edges[e] for e in abs_edges}

# union tree
for e in abs_edges:
	a, b, _ = edges[e]
	if Root[a] == a and Root[b] == b:
		for c in Children[Root[b]]:
			Root[c] = a
			Children[a].add(c)
	elif Root[a] == a and Root[b] != b:
		for c in Children[Root[b]]:
			Root[c] = Root[a]
			Children[Root[a]].add(c)	
	else:
		for c in Children[Root[a]]:
			Root[c] = Root[b]
			Children[Root[b]].add(c)

del_weight = 0
for ix, e in enumerate(sorted_edges):
	# edge eを追加できるかどうか
	a, b, c = edges[e]
	if Root[a] == Root[b]:
		del_weight += c
		continue
	if Root[a] == a and Root[b] == b:
		for c in Children[Root[b]]:
			Root[c] = a
			Children[a].add(c)
	elif Root[a] == a and Root[b] != b:
		for c in Children[Root[b]]:
			Root[c] = Root[a]
			Children[Root[a]].add(c)	
	else:
		for c in Children[Root[a]]:
			Root[c] = Root[b]
			Children[Root[b]].add(c)			
print(del_weight)