#include <iostream>
#include <bits/stdc++.h>
#include <cmath>
#include <algorithm>
#include <vector>
#include <deque>
#include <set>
#include <stack>
#include <string>
#include <map>
#include <queue>
#define int long long
#define sqrt sqrtl
using namespace std;
const long long oo = 1000000000000000000;
long long sum, ans = 0, mx = 0, mn = 1000000000, num, pos;
/*
ViHHiPuh
(( `'-""``""-'` ))
)-__-_.._-__-(
/ --- (o _ o) --- \
\ .-* ( .0. ) *-. /
_'-. ,_ '=' _, .-'_
/ `;#'#'# - #'#'#;` \
\_)) -----'#'----- ((_/
# --------- #
'# ------- ------ #'
/..-'# ------- #'-.\
_\...-\'# -- #'/-.../_
((____)- '#' -(____))
cout << fixed << setprecision(6) << x;
freopen ( "sum.in", "r", stdin )
*/
struct Node {
int dp, u;
};
vector <int> vv;
struct cmp {
bool operator () ( const Node& a, const Node& b ) const {
if ( a.dp == b.dp ) {
return a.u < b.u;
}
return a.dp < b.dp;
}
};
int n, m, x, y, z[ 200001 ], t[ 200001 ];
map <int, int> mp[ 100001 ], mpp[ 200001 ];
int dp[ 200001 ];
int dpp[ 200001 ];
vector <pair<int, int> > v[ 100001 ];
set <Node, cmp > st;
main () {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
cin >> n >> m;
for ( int i = 1; i <= m; i ++ ) {
cin >> x >> y >> z[ i ] >> t[ i ];
mp[ x ][ z[ i ] ] += t[ i ];
mp[ y ][ z[ i ] ] += t[ i ];
v[ x ].push_back( { y, i } );
v[ y ].push_back( { x, i } );
dpp[ i ] = oo;
}
for ( int i = 1; i <= n; i ++ )
dp[ i ] = oo;
dp[ 1 ] = 0;
st.insert( { 0, 1 } );
while ( st.size() ) {
Node u = *st.begin();
st.erase( st.begin() );
for ( auto to : v[ u.u ] ) {
dpp[ z[ to.second ] ] = min( dpp[ z[ to.second ] ], dp[ to.first ] );
}
for ( auto to : v[ u.u ] ) {
if ( dp[ to.first ] > u.dp + t[ to.second ] ) {
st.erase( { dp[ to.first ], to.first } );
dp[ to.first ] = u.dp + t[ to.second ];
st.insert( { dp[ to.first ], to.first } );
}
if ( dp[ to.first ] > u.dp + mp[ u.u ][ z[ to.second ] ] - t[ to.second ] ) {
st.erase( { dp[ to.first ], to.first } );
dp[ to.first ] = u.dp + mp[ u.u ][ z[ to.second ] ] - t[ to.second ];
st.insert( { dp[ to.first ], to.first } );
}
if ( dp[ to.first ] > dpp[ z[ to.second ] ] + mp[ u.u ][ z[ to.second ] ] - t[ to.second ] ) {
st.erase( { dp[ to.first ], to.first } );
dp[ to.first ] = dpp[ z[ to.second ] ] + mp[ u.u ][ z[ to.second ] ] - t[ to.second ];
st.insert( { dp[ to.first ], to.first } );
}
}
for ( auto to : v[ u.u ] )
dpp[ z[ to.second ] ] = oo;
}
mn = dp[ n ];
if ( mn == oo )
cout << "-1\n";
else
cout << mn << "\n";
}
