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

USE=[0]*N
E=[[] for i in range(N)]

for i in range(M):
    u,v,w=EDGE[i]
    E[u].append((v,i))

Q=[0]
NO=[]
while Q:
    x=Q.pop()
    USE[x]=1
    
    for to,ind in E[x]:
        if USE[to]==1:
            NO.append(ind)
        else:
            USE[to]=1
            Q.append(to)

E=[[] for i in range(N)]
E_INV=[[] for i in range(N)]
NO=set(NO)
for i in range(M):
    if i in NO:
        continue
    u,v,w=EDGE[i]
    E[u].append(v)
    E_INV[v].append(u)


def Top_sort(E):
    Parent=[-1]*N
    USEIND=[0]*N
    TOP=[]

    for ROOT in range(1):
        if Parent[ROOT]!=-1:
            continue
        Parent[ROOT]=ROOT

        NOW=ROOT

        while NOW!=ROOT or USEIND[ROOT]!=len(E[ROOT]):

            if USEIND[NOW]==len(E[NOW]):
                TOP.append(NOW)
                NOW=Parent[NOW]
            elif E[NOW][USEIND[NOW]]==Parent[NOW]:
                USEIND[NOW]+=1
            else:
                NEXT=E[NOW][USEIND[NOW]]
                USEIND[NOW]+=1
                if Parent[NEXT]==-1:
                    Parent[NEXT]=NOW
                    NOW=NEXT
        TOP.append(ROOT)
        
    return TOP[::-1]

TOP=Top_sort(E)


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

    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))

    for ind in TOP:
        for to,w in E[ind]:
            if DP[to]<DP[ind]+w:
                DP[to]=DP[ind]+w

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