#include <bits/stdc++.h>
using namespace std;
using ll = long long;
ll INF = 1e18;
ll MOD = 1e9 + 7;
struct zxc {
ll v;
ll cost;
ll revers;
};
struct node {
ll a, b, c, d;
};
ll n, m;
vector<vector<zxc>> g, rg;
vector<pair<ll, ll>> dxs(ll v) {
vector<pair<ll, ll>> dist(n, {INF, 0});
set<pair<ll, ll>> st;
dist[v].first = 0;
dist[v].second = 1;
st.insert({dist[v].first, v});
while (!st.empty()) {
ll u = st.begin()->second;
st.erase(st.begin());
for (auto to: g[u]) {
ll cnt = to.cost + dist[u].first;
if (dist[to.v].first > cnt) {
st.erase({dist[to.v].first, to.v});
dist[to.v].first = cnt;
st.insert({dist[to.v].first, to.v});
}
}
}
return dist;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
cout.tie(nullptr);
cin >> n >> m;
g.assign(n, {});
vector<node> r(m);
vector<ll> bad;
for (ll i = 0; i < m; i++) {
ll a, b, c, d;
cin >> a >> b >> c >> d;
a--;
b--;
r[i] = {a, b, c, d};
g[a].push_back({b, c, d});
bad.push_back(i);
}
vector<pair<ll, ll>> dist_l_a = dxs(0);
vector<pair<ll, ll>> dist_l_b = dxs(n - 1);
ll answer = dist_l_a[n - 1].first + dist_l_b[0].first;
for (ll i = 0; i < bad.size(); i++) {
g.assign(n, {});
for (ll j = 0; j < m; j++) {
ll a = r[j].a, b = r[j].b, c = r[j].c, d = r[j].d;
if (j == i) {
g[b].push_back({a, c, d});
continue;
}
g[a].push_back({b, c, d});
}
vector<pair<ll, ll>> v1 = dxs(0), v2 = dxs(n - 1);
answer = min(answer, v1[n - 1].first + v2[0].first + r[i].d);
}
if (answer >= INF) {
cout << -1 << endl;
return 0;
}
cout << answer;
}
