from collections import defaultdict,deque
N,M,L,S,E=map(int,input().split())
G=[[] for _ in range(N+1)]
D=defaultdict(int)
for _ in range(M):
    a,b,t=map(int,input().split())
    if a>b:a,b=b,a
    G[a].append(b)
    G[b].append(a)
    if D[(a,b)]==0:D[(a,b)]=t
    else:D[(a,b)]=min(D[(a,b)],t)
T=set(map(int,input().split()))
vis=[(1<<60,0) for _ in range(N+1)]
Q=deque()
# 現在地、時間、トイレ済
Q.append((1,0,0))
while Q:
    p,t,u=Q.popleft()
    vis[p]=(t,u)
    for n in G[p]:
        if p<n:a,b=p,n
        else:a,b=n,p
        nt=t
        if S+E<nt+D[(a,b)] and b in T:
            nt+=1;u=1
        if nt+D[(a,b)]<vis[n][0]:
            Q.append((n,nt+D[(a,b)],u))
if vis[N][0]==1<<60:
    print(-1)
else:
    ans=vis[N][0]
    if vis[N][0]<S:
        ans=S+1
    elif vis[N][1]==0:
        ans=vis[N][0]+1
    print(ans)