#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define FOR(i, a, b) for (int i = (a), _b = (b); i <= _b; i++)
#define FORD(i, b, a) for (int i = (b), _a = (a); i >= _a; i--)
#define pa pair<ll, ll>
#define fi first
#define se second
#define bit(mask, j) ((mask >> j) & 1)
#define t_test int t;cin >> t;while(t--)
const ll mod = 1e9 + 7;
const ll INF = 1e18;
inline void adm(ll &x){if(x>=mod)x%=mod;else if(x<0)x+=mod;}
//--------------------------------------------------------------------
const ll N = 1e5 + 10;
const ll M = 2e5 + 10;
ll n, m;
pa a[M];
vector<pa> g[N];
ll dx[M], timer, d[N][3], par[N];
ll color[M];
void DJK() {
priority_queue<pair<pa, pa>, vector<pair<pa, pa>>, greater<pair<pa, pa>>> q;
q.push({{0, 1}, {0, 0}});
memset(d, 0x3f, sizeof d);
d[1][0] = 0;
while(!q.empty()) {
ll u = q.top().fi.se, t = q.top().se.fi, par = q.top().se.se;
ll du = q.top().fi.fi;
q.pop();
if(du != d[u][(t != 0)]) continue;
if(u == n) {
cout << du;
exit(0);
}
timer++;
for(auto e : g[u]) {
ll v = e.fi, c = a[e.se].fi, p = a[e.se].se;
if(v == par) continue;
if(dx[c] < timer) {
color[c] = p;
dx[c] = timer;
}
else color[c] += p;
}
if(t == 0) { // da bi thay doi
for(auto e : g[u]) {
ll v = e.fi, c = a[e.se].fi, p = a[e.se].se;
if(d[v][0] > d[u][0] + p) {
d[v][0] = d[u][0] + p;
q.push({{d[v][0], v},{0, u}});
}
if(d[v][1] > d[u][0] + color[c] - p) {
d[v][1] = d[u][0] + color[c] - p;
q.push({{d[v][1], v},{c, u}});
}
}
}
else {
for(auto e : g[u]) {
ll v = e.fi, c = a[e.se].fi, p = a[e.se].se;
if(d[v][0] > d[u][1] + p) {
d[v][0] = d[u][1] + p;
q.push({{d[v][0], v},{0, u}});
}
if(t != c && d[v][1] > d[u][1] + color[c] - p) {
d[v][1] = d[u][1] + color[c] - p;
q.push({{d[v][1], v},{c, u}});
}
}
}
}
}
void hbmt() {
cin >> n >> m;
FOR(i, 1, m) {
ll u, v, c, p;
cin >> u >> v >> c >> p;
a[i] = {c, p};
g[u].push_back({v, i});
g[v].push_back({u, i});
}
DJK();
cout << -1;
}
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);cout.tie(0);
if(fopen("hbmt.inp", "r")) {
freopen("hbmt.inp", "r", stdin);
freopen("hbmt.out", "w", stdout);
}
// t_test
hbmt();
return 0;
}
