from heapq import *

n, m, k = map(int, input().split())
R = list(map(int, input().split()))
R = {r - 1:1 << i for i, r in enumerate(R)}
edges = [[] for _ in range(n)]
for i in range(m):
    a, b, c = map(int, input().split())
    a -= 1
    b -= 1
    if i in R:
        d = R[i]
    else:
        d = -1
    edges[a].append((b, c, d))
    edges[b].append((a, c, d))
    
inf = 1 << 40
dist = [[inf] * (1 << k) for _ in range(n)]
dist[0][0] = 0
hq = [(0, 0, 0)]
while hq:
    d, pos, bit = heappop(hq)
    if d > dist[pos][bit]:
        continue
    
    for npos, c, dbit in edges[pos]:
        if dbit == -1:
            nbit = bit
        else:
            nbit = bit | dbit
        
        if dist[npos][nbit] > c + d:
            dist[npos][nbit] = c + d
            heappush(hq, (c + d, npos, nbit))
print(dist[-1][-1])