import heapq
N,M,L = map(int,input().split())
L -= 1
lst = list(map(int,input().split()))
lsg = [[] for i in range(N)]
for i in range(M):
    a,b,c = map(int,input().split())
    a -= 1
    b -= 1
    lsg[a].append((b,c))
    lsg[b].append((a,c))
if sum(lst) == 1:
    print(0)
    exit()
INF = float('INF')
distL = [INF]*(N)
used = [False]*(N)
distL[L] = 0
h = [(0,L)]
while h:
    c,x = heapq.heappop(h)
    if used[x]:
        continue
    used[x] = True
    for j,cos in lsg[x]:
        if used[j]:
            continue
        if distL[j] > distL[x]+cos:
            distL[j] = distL[x]+cos
            heapq.heappush(h, (distL[j],j))
ans = INF
for i in range(N):
    st = i
    distC = [INF]*(N)
    used = [False]*(N)
    distC[st] = 0
    h = [(0,st)]
    while h:
        c,x = heapq.heappop(h)
        if used[x]:
            continue
        used[x] = True
        for j,cos in lsg[x]:
            if used[j]:
                continue
            if distC[j] > distC[x]+cos:
                distC[j] = distC[x]+cos
                heapq.heappush(h, (distC[j],j))
    divmax = -INF
    sumcost = 0
    for k in range(N):
        sumcost += distC[k]*lst[k]*2
        if lst[k] >= 1:
            divmax = max(divmax,distC[k]-distL[k])
    ans = min(ans,sumcost-divmax)
print(ans)