INF=float("inf")
n,m,k=map(int,input().split())
q=[-1]*m
for i,r in enumerate(list(map(lambda x: int(x)-1,input().split()))):
    q[r]=i
wf=[[INF]*n for i in range(n)]
e=[334]*k
for i in range(m):
    a,b,c=map(int,input().split())
    a,b=a-1,b-1
    wf[a][b]=wf[b][a]=c
    if q[i]!=-1:
        e[q[i]]=(a,b,c)

for p in range(n):
    wf[p][p]=0
    for i in range(n):
        for j in range(n):
            wf[i][j]=min(wf[i][j],wf[i][p]+wf[p][j])

dp=[[INF]*n for i in range(2**k)]
dp[0][0]=0
for bit in range(2**k):
    for i in range(n):
        for j in range(n):
            dp[bit][j]=min(dp[bit][j],dp[bit][i]+wf[i][j])
    for i,(a,b,c) in enumerate(e):
        dp[1<<i|bit][a]=min(dp[1<<i|bit][a],dp[bit][b]+c)
        dp[1<<i|bit][b]=min(dp[1<<i|bit][b],dp[bit][a]+c)
print(dp[-1][-1])