#include<bits/stdc++.h>
#define int long long
#pragma GCC optimize("O3")
#define all(v) v.begin(), v.end()
#define SZ(x) (int)x.size()
#define pii pair<int, int>
#define X first
#define Y second
using namespace std;
const int maxn = 2e5 + 10;
const int mod = 1e9 + 7;// 998244353;
const int llmx = 1e18;
void sol(){
int n, m;
cin >> n >> m;
vector< vector< array<int, 3> > > g(n + 1);
vector< vector< pii > > cnt(n + 1);
vector< int > dis(2 * m + n + 1, llmx);
vector< vector< pii > > num(n + 1);
vector< int > base(n + 1);
while(m--){
int a, b, c, p;
cin >> a >> b >> c >> p;
cnt[a].push_back({c, 0});
cnt[b].push_back({c, 0});
num[a].push_back({p, c});
num[b].push_back({p, c});
g[a].push_back({b, c, p});
g[b].push_back({a, c, p});
}
for(int i = 1; i <= n; ++i){
sort(all(cnt[i]));
cnt[i].resize(unique(all(cnt[i])) - cnt[i].begin());
num[i].push_back({0, 0});
sort(all(num[i]));
num[i].resize(unique(all(num[i])) - num[i].begin());
base[i] = base[i - 1] + SZ(num[i - 1]);
for(auto &[nxt, c, p] : g[i]){
auto it = lower_bound(all(cnt[i]), pii(c, 0));
it->Y += p;
}
}
auto get = [&](int id, int p, int c) -> int {
return base[id] + lower_bound(all(num[id]), pii(p, c)) - num[id].begin();
};
deque< array<int, 5> > pq;
dis[get(1, 0, 0)] = 0;
pq.push_back({0, 1, 0, 0, get(1, 0, 0)});
while(!pq.empty()){
auto [D, cur, cost, col, nid] = pq.front(); pq.pop_front();
if(dis[nid] != D) continue;
if(cur == n){
cout << D << "\n";
return;
}
for(auto &[nxt, c, p] : g[cur]){
int id1 = get(nxt, p, c);
int id2 = get(nxt, 0, 0);
int al = lower_bound(all(cnt[cur]), pii(c, 0))->Y;
int wei = max(0LL, al - p - (c == col ? cost : 0));
if(dis[id2] > D + wei){
dis[id2] = D + wei;
if(wei == 0) pq.push_front({dis[id2], nxt, 0, 0, id2});
else pq.push_back({dis[id2], nxt, 0, 0, id2});
}
if(dis[id1] > D + p){
dis[id1] = D + p;
pq.push_back({dis[id1], nxt, p, c, id1});
}
}
}
cout << "-1\n";
}
/*
4 6
1 4 4 4
3 4 1 3
1 3 4 4
2 4 3 1
2 3 3 2
1 2 4 2
// 3
5 2
1 4 1 2
3 5 1 4
// -1
5 7
2 3 7 1
1 4 5 1
4 5 3 1
3 4 7 1
2 4 3 1
3 5 6 1
1 2 5 1
// 1
13 21
7 10 4 4
3 6 4 7
8 10 4 5
3 9 2 5
1 4 4 5
2 6 4 2
3 11 2 2
3 8 16 2
8 11 16 1
6 10 4 14
6 8 16 6
9 12 16 5
5 13 4 6
1 12 4 7
2 4 4 18
2 9 4 10
2 12 4 6
10 13 4 28
5 7 2 5
5 11 2 16
7 13 4 20
// 7
*/
signed main(){
ios::sync_with_stdio(0), cin.tie(0), cerr.tie(0);
int t = 1; //cin >> t;
while(t--) sol();
}
