#include "bits/stdc++.h"
using namespace std;
#define ar array
#define int long long
const int N = 1e5 + 5;
struct node{
int a, b, c, p;
};
vector<int> edges[N];
vector<ar<int, 3>> ee[N];
map<int, vector<ar<int, 2>>> ed[N];
map<int, int> uu[N];
int d[N], used[N];
node e[N];
signed main(){
ios::sync_with_stdio(0); cin.tie(0);
int n, m; cin>>n>>m;
for(int i=0;i<m;i++){
node& x = e[i]; cin>>x.a>>x.b>>x.c>>x.p;
edges[x.a].push_back(i);
edges[x.b].push_back(i);
}
for(int i=1;i<=n;i++){
map<int, int>& mm = uu[i];
for(auto in : edges[i]){ auto& x = e[in];
mm[x.c] += x.p;
}
for(auto in : edges[i]){ auto& x = e[in];
int b = x.a + x.b - i;
if(mm[x.c] > x.p){
ee[i].push_back({b, x.p, -x.c});
if(x.p > mm[x.c] - x.p){
ee[i].push_back({b, mm[x.c] - x.p, x.c});
}
} else {
ee[i].push_back({b, 0, x.c});
}
ed[i][x.c].push_back({b, x.p});
}
}
priority_queue<ar<int, 5>, vector<ar<int, 5>>, greater<ar<int, 5>>> q;
q.push({0, 1, 0, 0, 0});
memset(d, 127, sizeof d);
while(!q.empty()){
int D = q.top()[0], u = q.top()[1], c = q.top()[2], p = q.top()[3], v = q.top()[4]; q.pop();
if(c < 0){ c = abs(c);
int sum = uu[u][c], is = 0;
for(auto x : ed[u][c]){
if(x[0] == v) { is = 1; continue; }
q.push({D + sum - x[1], x[0], c, x[1], u});
}
ed[u][c].clear();
if(is) ed[u][c].push_back({v, p});
} else if(!used[u]) {
used[u] = 1;
d[u] = D;
for(auto x : ee[u]){
q.push({D + x[1], x[0], abs(x[2]), x[1], u});
if(x[2] < 0) {
q.push({D, x[0], x[2], x[1], u});
}
}
}
}
if(d[n] > 1e18) cout<<-1<<"\n";
else cout<<d[n]<<"\n";
}
