import heapq
INF = 1<<60
def dijkstra(s, edge):
    n = len(edge)
    dist = [INF]*n
    dist[s] = 0
    edgelist = []
    heapq.heappush(edgelist,(dist[s], s))
    while edgelist:
        minedge = heapq.heappop(edgelist)
        if dist[minedge[1]] < minedge[0]:
            continue
        v = minedge[1]
        for e in edge[v]:
            if dist[e[1]] > dist[v]+e[0]:
                dist[e[1]] = dist[v]+e[0]
                heapq.heappush(edgelist,(dist[e[1]], e[1]))
    return dist

import sys
import io, os
input = io.BytesIO(os.read(0,os.fstat(0).st_size)).readline

def main():

    n, m, l = map(int, input().split())
    l -= 1
    T = list(map(int, input().split()))
    g = [[] for i in range(n)]
    for i in range(m):
        a, b, c = map(int, input().split())
        a, b = a-1, b-1
        g[a].append((c, b))
        g[b].append((c, a))

    D = [dijkstra(i, g) for i in range(n)]

    ans = INF
    for i in range(n):
        s=sum(T[j]*D[i][j] for j in range(n))*2
        if s:
            s+=min(D[l][j]-D[i][j] for j in range(n) if T[j])
        ans=min(ans,s)
    print(ans)

if __name__ == '__main__':
    main()