#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define fi first
#define se second
#define Task "test"
typedef pair<int,int>ii;
typedef pair<ll,ii>iii;
const int MOD = 1e9+7;
const ll INF = 1e18+7;
const int Maxn = 1e5+2;
const int di[] = {0, 0, -1, 1};
const int dj[] = {-1, 1, 0, 0};
map<int,ll>del[Maxn],cost[Maxn];
ll dist[Maxn];
vector<iii>g[Maxn];
bool cmp(iii i,iii j){
return i.se.fi<j.se.fi;
}
void run_case(){
int n,m;
cin>>n>>m;
while(m--){
int u,v,c,p;
cin>>u>>v>>c>>p;
g[u].push_back({v,{c,p}});
g[v].push_back({u,{c,p}});
}
for(int u=1;u<=n;u++){
sort(g[u].begin(),g[u].end(),cmp);
for(iii x:g[u]){
int c=x.se.fi,p=x.se.se;
cost[u][c]+=1LL*p;
}
}
for(int i=1;i<=n;i++) dist[i]=INF;
priority_queue<iii,vector<iii>,greater<iii>>q;
q.push({0,{1,0}});
dist[1]=0;
while(!q.empty()){
int u=q.top().se.fi,col=q.top().se.se;
ll val=q.top().fi;
q.pop();
if (col>0){
if (del[u][col]<val) continue;
int l=0,r=g[u].size()-1,pos=-1;
while(l<=r){
int mid=(l+r)/2;
int c=g[u][mid].se.fi;
if (c==col) pos=mid,r=mid-1;
else if (c<col) l=mid+1;
else r=mid-1;
}
if (pos==-1) continue;
for(int i=pos;i<g[u].size() && g[u][i].se.fi==col;i++){
int v=g[u][i].fi,p=g[u][i].se.se;
ll ex=del[u][col]+cost[u][col]-1LL*p;
if (dist[v]>ex){
dist[v]=ex;
q.push({dist[v],{v,0}});
}
}
}
else{
if (dist[u]<val) continue;
for(iii x:g[u]){
int c=x.se.fi,v=x.fi,p=x.se.se;
ll ex=dist[u]+cost[u][c]-1LL*p;
if (dist[v]>ex){
dist[v]=ex;
q.push({dist[v],{v,0}});
}
ll otl=dist[u]+1LL*p;
if (dist[v]>otl){
dist[v]=otl;
q.push({dist[v],{v,0}});
}
if (!del[v][c] || dist[u]<del[v][c]){
del[v][c]=dist[u];
q.push({del[v][c],{v,c}});
}
}
}
}
if (dist[n]>=INF) cout<<-1;
else cout<<dist[n];
}
int main(){
ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
if (fopen(Task ".inp", "r"))
{
freopen(Task ".inp", "r", stdin);
freopen(Task ".out", "w", stdout);
}
int t = 1;
//cin >> t;
while(t--){
run_case();
}
}
