import time
t1 = time.time()

import itertools
import heapq

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

route = [[] for _ in [0]*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 rlist):
		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 = [[-1]*N for _ in [0]*N]
	for i in st:
		q = [(0,i)]
		cnt = 0
		while(q and cnt < N):
			d,v = heapq.heappop(q)
			if(dist[i][v] == -1):
				cnt += 1
				dist[i][v] = d
				for nv,nd in route[v]:
					heapq.heappush(q,(d + nd,nv))
	return dist
ans = 10 ** 9
import random
rsum = sum(edge[i][2] for i in rlist)
dist = dijkstra(route)
while time.time() - t1 <= 4.9:
    random.shuffle(rlist)
    for bit in range(1 << K):
        s = rsum
        path = [0]
        for i in range(K):
            if(bit & (1 << i)):
                path.append(edge[rlist[i]][0])
                path.append(edge[rlist[i]][1])
            else:
                path.append(edge[rlist[i]][1])
                path.append(edge[rlist[i]][0])
        path.append(N-1)
        for i in range(0,len(path)-1,2):
            s += dist[path[i]][path[i+1]]
        if(ans > s):
            ans = s

print(ans)