#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 = 1e17+7;
const int Maxn = 1e5+7;
const int di[] = {0, 0, -1, 1};
const int dj[] = {-1, 1, 0, 0};
vector<iii>g[Maxn];
ll dist[Maxn];
map<int,ll>cost[Maxn],dp[Maxn];
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 i=1;i<=n;i++){
for(iii x:g[i]){
int c=x.se.fi,p=x.se.se;
cost[i][c]+=1LL*p;
}
}
for(int i=1;i<=n;i++) dist[i]=INF;
dist[1]=0;
priority_queue<iii,vector<iii>,greater<iii>>q;
q.push({dist[1],{1,0}});
while(!q.empty()){
int col=q.top().se.se,u=q.top().se.fi;
ll sum=q.top().fi;
q.pop();
if (col){
if (dp[u][col]<sum) continue;
for(iii x:g[u]){
int c=x.se.fi;
if (c!=col) continue;
int v=x.fi,p=x.se.se;
ll ex=dp[u][col]+cost[u][col]-1LL*p;
if (dist[v]>ex){
dist[v]=ex;
q.push({dist[v],{v,0}});
}
}
}
else{
if (dist[u]<sum) continue;
for(iii x:g[u]){
int v=x.fi,c=x.se.fi,p=x.se.se;
ll fee=dist[u]+1LL*p;
if (dist[v]>fee){
dist[v]=fee;
q.push({dist[v],{v,0}});
}
ll ex=dist[u]+cost[u][c]-1LL*p;
if (dist[v]>ex){
dist[v]=ex;
q.push({dist[v],{v,0}});
}
if (!dp[v][c] || dp[v][c]>dist[u]){
dp[v][c]=dist[u];
q.push({dp[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();
}
}
