#include <bits/stdc++.h>
using namespace std;
template <class T> bool mini(T &x, const T &y) { return y < x ? x = y, 1 : 0; }
template <class T> bool maxi(T &x, const T &y) { return y > x ? x = y, 1 : 0; }
const int N = 1e5 + 1;
int n, m, S, T, U, V;
vector<pair<int, int>> adj[N];
long long d[N], f[N], f2[N], f3[N];
bool avail[N], mark[N];
int main() {
ios::sync_with_stdio(0);
cin.tie(0);
cin >> n >> m >> S >> T >> U >> V;
for (int i = 1, u, v, w; i <= m; i++) {
cin >> u >> v >> w;
adj[u].push_back({ v, w });
adj[v].push_back({ u, w });
}
priority_queue<pair<long long, int>> pq;
memset(d, 0x3f, 8 * N);
memset(f, 0x3f, 8 * N);
pq.push({ d[S] = 0, S });
while (pq.size()) {
int u = pq.top().second;
pq.pop();
if (avail[u]) continue;
avail[u] = 1;
for (auto [v, w] : adj[u])
if (mini(d[v], d[u] + w)) pq.push({ -d[v], v });
}
memset(avail, 0, N);
queue<int> q;
q.push(T);
vector<int> t;
while (q.size()) {
int u = q.front();
q.pop();
if (avail[u]) continue;
t.push_back(u);
mark[u] = 1;
avail[u] = 1;
for (auto [v, w] : adj[u])
if (d[v] + w == d[u]) q.push(v);
}
memset(avail, 0, N);
pq.push({ f[U] = 0, U });
while (pq.size()) {
int u = pq.top().second;
pq.pop();
if (avail[u]) continue;
avail[u] = 1;
for (auto [v, w] : adj[u])
if (mini(f[v], f[u] + w)) pq.push({ -f[v], v });
}
memset(f2, 0x3f, 8 * N);
memset(f3, 0x3f, 8 * N);
for (int u : t) {
mini(f2[u], f[u]);
for (auto [v, w] : adj[u])
if (mark[v] && d[u] == d[v] + w) mini(f2[v], f2[u]);
}
reverse(t.begin(), t.end());
for (int u : t) {
mini(f3[u], f[u]);
for (auto [v, w] : adj[u])
if (mark[v] && d[u] + w == d[v]) mini(f3[v], f3[u]);
}
for (int u : t) pq.push({ -(f[u] = min(f2[u], f3[u])), u });
memset(avail, 0, N);
while (pq.size()) {
int u = pq.top().second;
pq.pop();
if (avail[u]) continue;
avail[u] = 1;
for (auto [v, w] : adj[u])
if (mini(f[v], f[u] + w)) pq.push({ -f[v], v });
}
cout << f[V];
}
