#pragma GCC optimize ("O3")
#pragma GCC target ("tune=native")
#pragma GCC target ("avx")

#include <bits/stdc++.h>

// 汎用マクロ
#define ALL_OF(x) (x).begin(), (x).end()
#define REP(i,n) for (long long i=0, i##_len=(n); i<i##_len; i++)
#define RANGE(i,is,ie) for (long long i=(is), i##_end=(ie); i<=i##_end; i++)
#define DSRNG(i,is,ie) for (long long i=(is), i##_end=(ie); i>=i##_end; i--)
#define UNIQUE(v) { sort((v).begin(), (v).end()); (v).erase(unique((v).begin(), (v).end()), (v).end()); }
template<class T> bool chmax(T &a, const T &b) {if (a < b) {a = b; return true;} return false; }
template<class T> bool chmin(T &a, const T &b) {if (a > b) {a = b; return true;} return false; }
#define INF 0x7FFFFFFF
#define LINF 0x7FFFFFFFFFFFFFFFLL
#define Yes(q) (q ? "Yes" : "No")
#define YES(q) (q ? "YES" : "NO")
#define DUMP(q) cerr << "[DEBUG] " #q ": " << (q) << " at " __FILE__ ":" << __LINE__ << endl
#define DUMPALL(q) { cerr << "[DEBUG] " #q ": ["; REP(dumpall_i, (q).size()) { cerr << q[dumpall_i] << (dumpall_i == (q).size() - 1 ? "" : ", "); } cerr << "] at " __FILE__ ":" << __LINE__ << endl; }
template<class T> T gcd(const T &a, const T &b) { return a < b ? gcd(b, a) : b ? gcd(b, a % b) : a; }
template<class T> T lcm(const T &a, const T &b) { return a / gcd(a, b) * b; }

// gcc拡張マクロ
#define popcount __builtin_popcount
#define popcountll __builtin_popcountll

// エイリアス
using  ll = long long;
using ull = unsigned long long;
using  ld = long double;
using namespace std;

// モジュール


// 処理内容
int main() {
    
    ll n, m, p, q, t;
    cin >> n >> m >> p >> q >> t;
    p--; q--;

    vector<vector<ll>> d(n, vector<ll>(n, INF));
    REP(i, m) {
        ll a, b, c;
        cin >> a >> b >> c;
        a--; b--;
        d[a][b] = c;
        d[b][a] = c;
    }
    REP(i, n) {
        d[i][i] = 0;
    }

    // waasharu huroido mesoddo
    REP(k, n) REP(i, n) REP(j, n) {
        chmin(d[i][j], d[i][k] + d[k][j]);
    }

    // always together (hokkori)
    if (d[0][p] + d[p][q] + d[q][0] <= t) {
        cout << t << endl;
        return 0;
    }

    ll ans = -1;

    // they have to trip apart
    // 0 -> i -> p -> j -> 0
    //      +--> q ---^
    REP(i, n) REP(j, n) { // i: 経由点
        ll tt = d[0][i] + d[j][0];
        ll tn = tt + max(d[i][p] + d[p][j], d[i][q] + d[q][j]);
        if (tn <= t) {
            chmax(ans, tt + (t - tn));
        }
    }

    cout << ans << endl;
    
}