#高速化なし

import itertools
import heapq
INF = float("inf")

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

route = [[] for _ in range(N)]
edge = [0]*M
st = set([0,N-1])
for i in range(M):
	A,B,C = map(int,input().split())
	A -= 1;	B -= 1
	if(i in R):
		edge[i] = [A,B,C]
		st.add(A);	st.add(B)
	route[A].append((B,C))
	route[B].append((A,C))

def dijkstra(route):
	dist = {}
	for i in st:
		q = [(0,i)]
		cnt = 0
		while(q and cnt < N):
			d,v = heapq.heappop(q)
			if((i,v) not in dist):
				cnt += 1
				dist[(i,v)] = d
				for nv,nd in route[v]:
					heapq.heappush(q,(d + nd,nv))
	return dist

ans = INF
rsum = sum(edge[i][2] for i in R)
dist = dijkstra(route)


for rbit in range(1 << K):
	b = [(rbit >> i) & 1 for i in range(K)]

	dp = [[INF]*K for i in range(1 << K)]
	for i in range(K):
		p = edge[lR[i]][b[i]]
		dp[1 << i][i] = dist[(0,p)] + rsum
	
	for bit in range(1, 1 << K):
		for s in range(K):
			p = edge[lR[s]][b[s]^1]
			if not(bit & (1 << s)):
				continue
			for t in range(K):
				np = edge[lR[t]][b[t]]
				k = bit | (1 << t)
				d = dp[bit][s] + dist[(p,np)]
				if((bit & (1 << t)) == 0):
					dp[k][t] = min(dp[k][t],d)

	c = INF
	for i in range(K):
		p = edge[lR[i]][b[i]^1]
		d = dp[-1][i] + dist[(p,N-1)]
		c = min(c,d)

	ans = min(ans,c)

print(ans)