#include <bits/stdc++.h>
using namespace std;
#define m_p make_pair
#define all(x) (x).begin(),(x).end()
#define sz(x) ((int)(x).size())
#define fi first
#define se second
typedef long long ll;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
mt19937 rnf(2106);
const int N = 200005;
struct ban
{
int x, c;
ll p;
ban(){}
ban(int x, int c, ll p)
{
this->x = x;
this->c = c;
this->p = p;
}
};
bool operator<(const ban& a, const ban& b)
{
return a.p > b.p;
}
bool so(const ban& a, const ban& b)
{
return a.c < b.c;
}
int n, m;
vector<ban> g[N];
void solv()
{
cin >> n >> m;
for (int i = 0; i < m; ++i)
{
int x, y, c, p;
cin >> x >> y >> c >> p;
g[x].push_back(ban(y, c, p));
g[y].push_back(ban(x, c, p));
}
map<pair<int, int>, int> mp;
for (int x = 1; x <= n; ++x)
{
sort(all(g[x]), so);
for (int i = 0; i < g[x].size(); ++i)
{
if (i == 0 || g[x][i].c != g[x][i - 1].c)
mp[m_p(x, g[x][i].c)] = i;
}
}
set<pair<int, int> > c;
priority_queue<ban> q;
q.push(ban(1, 0, 0));
while (1)
{
ban t;
do
{
if (q.empty())
{
cout << "-1\n";
return;
}
t = q.top();
q.pop();
} while (c.find(m_p(t.x, t.c)) != c.end());
c.insert(m_p(t.x, t.c));
if (t.x == n && t.c == 0)
{
cout << t.p << "\n";
return;
}
if (t.c == 0)
{
map<int, ll> s;
for (int i = 0; i < g[t.x].size(); ++i)
{
ban h = g[t.x][i];
s[g[t.x][i].c] += g[t.x][i].p;
}
for (int i = 0; i < g[t.x].size(); ++i)
{
ban h = g[t.x][i];
h.p = t.p;
q.push(h);
}
for (int i = 0; i < g[t.x].size(); ++i)
{
ban h = g[t.x][i];
h.p += t.p;
h.c = 0;
q.push(h);
}
for (int i = 0; i < g[t.x].size(); ++i)
{
ban h = g[t.x][i];
h.p = t.p;
h.p += s[g[t.x][i].c] - g[t.x][i].p;
h.c = 0;
q.push(h);
}
}
else
{
assert(mp.find(m_p(t.x, t.c)) != mp.end());
ll s = 0;
for (int i = mp[m_p(t.x, t.c)]; i < g[t.x].size(); ++i)
{
ban h = g[t.x][i];
if (h.c != t.c)
break;
s += h.p;
}
for (int i = mp[m_p(t.x, t.c)]; i < g[t.x].size(); ++i)
{
ban h = g[t.x][i];
if (h.c != t.c)
break;
h.p = t.p;
h.p += s - g[t.x][i].p;
h.c = 0;
q.push(h);
}
}
}
}
int main()
{
#ifdef SOMETHING
freopen("input.txt", "r", stdin);
//freopen("output.txt", "w", stdout);
#endif // SOMETHING
ios_base::sync_with_stdio(false), cin.tie(0);
int tt = 1;
//cin >> tt;
while (tt--)
{
solv();
}
return 0;
}
