#include <bits/stdc++.h>
using namespace std;
#define ll long long
const ll N = 201, M = 50001;
ll n, m;
vector<pair<ll, ll>> adj[N];
ll c[M], d[M];
pair<ll, ll> edges[M];
vector<ll> sssp(ll source, ll i, bool b) {
vector<ll> dist(n + 1, 1e15);
dist[source] = 0;
priority_queue<pair<ll, ll>> pq;
pq.push({0, source});
while (!pq.empty()) {
ll node = pq.top().second, _dist = -pq.top().first;
pq.pop();
for (auto &nb : adj[node]) {
if (edges[nb.second].first != node) {
if (!(nb.second == i && b)) {
continue;
}
} else if (nb.second == i and b) {
continue;
}
if (dist[nb.first] > _dist + c[nb.second]) {
dist[nb.first] = _dist + c[nb.second];
pq.push({-dist[nb.first], nb.first});
}
}
}
return dist;
}
int main() {
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cin >> n >> m;
for (ll i = 1; i <= n; ++i) {
adj[i].clear();
}
for (ll i = 0, u, v; i < m; ++i) {
cin >> u >> v >> c[i] >> d[i];
adj[u].emplace_back(v, i), adj[v].emplace_back(u, i);
edges[i] = {u, v};
}
ll ans = min((ll)1e15, sssp(1, 0, 0)[n] + sssp(n, 0, 0)[1]);
for (ll i = 0; i < m; ++i) {
ans = min(ans, d[i] + sssp(1, i, 1)[n] + sssp(n, i, 1)[1]);
}
if (ans == (ll)1e15) {
ans = -1;
}
cout << ans << "\n";
}
