#dijkstra?
from heapq import heappop, heappush, heapify
n,m,l=map(int,input().split())
T=list(map(int,input().split()))
graph=[[] for _ in range(n+1)]
dist=[[10**10]*(n+1) for _ in range(n+1)]
if sum(T)==1:
    print(0)
else:
    for _ in range(m):
        a,b,c=map(int,input().split())
        graph[a].append((c,b))
        graph[b].append((c,a))
    def dij(s,graph,dist):
        used=[False]*(n+1)
        used[s]=True
        dist[s][s]=0
        edgelist=[]
        for es in graph[s]:
            heappush(edgelist,es)
        while edgelist:
            kyori,ten=heappop(edgelist)
            if used[ten]==True:
                continue
            dist[s][ten]=kyori
            used[ten]=True
            for es in graph[ten]:
                if used[es[1]]==False:
                    heappush(edgelist,(es[0]+dist[s][ten], es[1]))
        return dist
    ans=10**20
    for i in range(1,n+1):
        dist=dij(i, graph,dist)
    for p in range(1,n+1):
        ouhuku=0
        for j in range(n):
            ouhuku+=2*T[j]*dist[p][j+1]
        for first in range(1,n+1):
            if T[first-1]==0:
                continue
            if first==p:
                temp=ouhuku+dist[l][first]
            else:
                temp=ouhuku+dist[l][first]+dist[first][p]-(dist[p][first]*2)
            ans=min(ans,temp)
    print(ans)