#pragma GCC optimize("O3")
#pragma GCC target("avx,avx2")
#include <bits/stdc++.h>
#define int long long
struct Vert
{
int stop;
int cost;
int color;
int ind;
Vert() = default;
Vert(int stop, int cost, int color, int ind) : stop(stop), cost(cost), color(color), ind(ind) {};
};
signed
main()
{
std::ios::sync_with_stdio(false);
std::cin.tie(0);
int n, m;
std::cin >> n >> m;
std::vector<std::vector<Vert>> g(n);
for (int i = 0; i < m; i++)
{
int a, b;
int c, p;
std::cin >> a >> b >> c >> p;
a--, b--;
g[a].push_back(Vert(b, p, c, i));
g[b].push_back(Vert(a, p, c, i));
}
std::vector<std::map<int, int>> dist(n);
dist[0][-1] = 0;
std::set<std::pair<int, std::pair<int, int>>> s;
s.insert({dist[0][-1], {0, -1}});
while (s.size() > 0)
{
auto v = s.begin()->second;
// std::cout << v.first << ' ' << v.second << std::endl;
s.erase(s.begin());
std::map<int, int> all;
for (auto u : g[v.first])
{
if (u.ind != v.second)
{
all[u.color] += u.cost;
}
}
for (auto u : g[v.first])
{
int now = u.cost;
if (u.ind == v.second)
continue;
if (dist[u.stop].find(u.ind) == dist[u.stop].end() || dist[u.stop][u.ind] > dist[v.first][v.second] + now)
{
s.erase(std::make_pair(dist[u.stop][u.ind], std::make_pair(u.stop, u.ind)));
dist[u.stop][u.ind] = dist[v.first][v.second] + now;
s.insert(std::make_pair(dist[u.stop][u.ind], std::make_pair(u.stop, u.ind)));
}
now = std::min(u.cost, all[u.color] - u.cost);
if (dist[u.stop].find(-1) == dist[u.stop].end() || dist[u.stop][-1] > dist[v.first][v.second] + now)
{
s.erase(std::make_pair(dist[u.stop][-1], std::make_pair(u.stop, -1)));
dist[u.stop][-1] = dist[v.first][v.second] + now;
s.insert(std::make_pair(dist[u.stop][-1], std::make_pair(u.stop, -1)));
}
}
}
int min = 1e18;
for (auto i : dist[n - 1])
{
min = std::min(min, i.second);
}
if (min == 1e18)
{
std::cout << -1;
return 0;
}
std::cout << min;
}
