import sys

def input(): return sys.stdin.readline().strip()
def list2d(a, b, c): return [[c] * b for i in range(a)]
def list3d(a, b, c, d): return [[[d] * c for j in range(b)] for i in range(a)]
def list4d(a, b, c, d, e): return [[[[e] * d for j in range(c)] for j in range(b)] for i in range(a)]
def ceil(x, y=1): return int(-(-x // y))
def INT(): return int(input())
def MAP(): return map(int, input().split())
def LIST(N=None): return list(MAP()) if N is None else [INT() for i in range(N)]
def Yes(): print('Yes')
def No(): print('No')
def YES(): print('YES')
def NO(): print('NO')
sys.setrecursionlimit(10 ** 9)
INF = 10 ** 19
MOD = 10 ** 9 + 7
EPS = 10 ** -10

def dijkstra(nodes: list, src: int) -> list:
    """ ダイクストラ高速化版(隣接リスト(0-indexed), 始点) """
    from heapq import heappush, heappop

    N = len(nodes)
    res = [INF] * N
    que = [src]
    res[src] = 0
    while que:
        cur = heappop(que)
        dist = cur // N
        cur %= N
        if res[cur] < dist:
            continue    
        for nxt, cost in nodes[cur]:
            if dist + cost < res[nxt]:
                res[nxt] = dist + cost
                heappush(que, (dist+cost)*N+nxt)
    return res

N, M, p, q, t = MAP()
p -= 1; q -= 1
nodes = [[] for i in range(N)]
for i in range(M):
    a, b, c = MAP()
    a -= 1; b -= 1

    nodes[a].append((b, c))
    nodes[b].append((a, c))

dist1 = dijkstra(nodes, 0)
dist2 = dijkstra(nodes, p)
dist3 = dijkstra(nodes, q)

ans = -1
for i in range(N):
    for j in range(N):
        have = t - (dist1[i] + dist1[j] + max(dist2[i] + dist2[j], dist3[i] + dist3[j]))
        if have >= 0:
            ans = max(ans, have + dist1[i] + dist1[j])
        have = t - (dist1[i] + dist2[i] + dist3[i] + dist1[j] + dist2[j] + dist3[j])
        if have >= 0:
            ans = max(ans, t)
print(ans)