import sys
from heapq import heappop, heappush

input = sys.stdin.buffer.readline
INF = 10**18


def dijkstra(N, G, s):
    dist = [INF] * N
    que = [(0, s)]
    dist[s] = 0
    while que:
        c, v = heappop(que)
        if dist[v] < c:
            continue
        for t, cost in G[v]:
            if dist[v] + cost < dist[t]:
                dist[t] = dist[v] + cost
                heappush(que, (dist[t], t))
    return dist


N, M, L = map(int, input().split())
L -= 1
T = tuple(map(int, input().split()))
G = [[] for _ in range(N)]
for _ in range(M):
    a, b, c = map(int, input().split())
    a -= 1
    b -= 1
    G[a].append((b, c))
    G[b].append((a, c))

dist_all = []
for source in range(N):
    dist_all.append(dijkstra(N, G, source))
ans = INF
for target in range(N):
    s = sum(T[x] * 2 * dist_all[x][target] for x in range(N))
    m = max(dist_all[target][x] - dist_all[L][x] for x in range(N) if T[x] != 0)
    ans = min(ans, s - m)
print(ans)