#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)]
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=[]
for i in range(1,n+1):
    dist=dij(i, graph,dist)
for first in range(1,n+1):
    a=dist[l][first]
    for p in range(1,n+1):
        temp=a
        temp+=dist[first][p]
        for j in range(n):
            cnt=T[j]
            if j == first-1:
                cnt-=1
            temp+=2*cnt*dist[p][j+1]
        ans.append(temp)
print(min(ans))