import sys
input = sys.stdin.readline

from heapq import heappop,heappush

N,M,C=map(int,input().split())

EDGE=[list(map(int,input().split())) for i in range(M)]

for i in range(M):
    EDGE[i][0]-=1
    EDGE[i][1]-=1

Q=list(map(int,input().split()))

for i in range(C):
    Q[i]-=1

USE=[1]*M

for q in Q:
    USE[q]^=1
    
    DP=[-1<<63]*N
    DP[0]=0
    Q=[(0,0)]

    E=[[] for i in range(N)]

    for i in range(M):
        if USE[i]==0:
            continue
        x,y,dis=EDGE[i]
        E[x].append((y,dis))

    #print(E)

    while Q:
        now,ind=heappop(Q)

        if DP[ind]!=now:
            continue

        now=-now

        for to,w in E[ind]:
            if DP[to]<now+w:
                DP[to]=now+w
                heappush(Q,(DP[to],to))

    if DP[-1]<-1000000000:
        print("NaN")
    else:
        print(DP[-1])