#include <bits/stdc++.h>
using namespace std;
#define rep(i,a,n) for (int i=a;i<n;i++)
#define per(i,a,n) for (int i=n-1;i>=a;i--)
#define pb push_back
#define eb emplace_back
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define SZ(x) ((int)(x).size())
typedef vector<int> VI;
typedef basic_string<int> BI;
typedef long long ll;
typedef pair<int,int> PII;
typedef double db;
mt19937 mrand(random_device{}());
const ll mod=1000000007;
int rnd(int x) { return mrand() % x;}
ll powmod(ll a,ll b) {ll res=1;a%=mod; assert(b>=0); for(;b;b>>=1){if(b&1)res=res*a%mod;a=a*a%mod;}return res;}
ll gcd(ll a,ll b) { return b?gcd(b,a%b):a;}
// head
const int N=50500;
const ll inf=1e18;
int n,m,u[N],v[N],c[N],d[N];
ll dis[2][N];
vector<PII> e[N];
void dijkstra(int v,ll* d) {
rep(i,1,n+1) d[i]=inf;
d[v]=0;
set<pair<ll,int>> st;
st.insert({0,v});
while (SZ(st)) {
auto it=st.begin();
int i=it->second;
st.erase(it);
for (auto& p:e[i]) {
int j=p.fi,w=p.se;
if (d[j]>d[i]+w) {
if (d[j]!=inf) st.erase(st.find({d[j],j}));
d[j]=d[i]+w;
st.insert({d[j],j});
}
}
}
}
ll solve(int id) {
rep(i,1,n+1) e[i].clear();
rep(i,0,m) {
if (i==id) e[v[i]].pb({u[i],c[i]+d[i]});
else e[u[i]].pb({v[i],c[i]});
}
dijkstra(1,dis[0]);
dijkstra(n,dis[1]);
return dis[0][n]+dis[1][1];
}
int main() {
scanf("%d%d",&n,&m);
rep(i,0,m) {
scanf("%d%d%d%d",u+i,v+i,c+i,d+i);
e[u[i]].pb({v[i],c[i]});
}
dijkstra(1,dis[0]);
dijkstra(n,dis[1]);
ll ans=dis[0][n]+dis[1][1];
rep(i,0,m) ans=min(ans,solve(i));
if (ans>=inf) ans=-1;
printf("%lld",ans);
}
