import itertools

N,M,K = map(int,input().split())
R = [i-1 for i in map(int,input().split())]

INF = float("inf")
dist = [[INF]*N for _ in [0]*N]
route = [[0]*2 for _ in [0]*M]
for i in range(M):
	A,B,C = map(int,input().split())
	A -= 1;	B -= 1
	route[i] = [A,B,C]
	dist[A][B] = dist[B][A] = C

def warshall_floyd(dist):
	for i in range(N):
		dist[i][i] = 0
	for k in range(N):
		for i in range(N):
			for j in range(N):
				d = dist[i][k]+dist[k][j]
				if(dist[i][j] > d):
					dist[i][j] = d
	return 0

warshall_floyd(dist)
ans = INF
rsum = sum(route[i][2] for i in R)
for rlist in itertools.permutations(R):
	for bit in range(1 << K):
		s = rsum
		path = [0]
		for i in range(K):
			if(bit & (1 << i)):
				path.append(route[rlist[i]][0])
				path.append(route[rlist[i]][1])
			else:
				path.append(route[rlist[i]][1])
				path.append(route[rlist[i]][0])
		path.append(N-1)
		s += sum(dist[path[i]][path[i+1]] for i in range(0,len(path)-1,2))
		if(ans > s):
			ans = s

print(ans)