#include <iostream>
#include <cstdio>
#include <cmath>
#include <ctime>
#include <cstdlib>
#include <cassert>
#include <vector>
#include <list>
#include <stack>
#include <queue>
#include <deque>
#include <map>
#include <set>
#include <bitset>
#include <string>
#include <algorithm>
#include <utility>
#include <complex>
#define rep(x, s, t) for(llint (x) = (s); (x) <= (t); (x)++)
#define chmin(x, y) (x) = min((x), (y))
#define chmax(x, y) (x) = max((x), (y))
#define all(x) (x).begin(),(x).end()
#define inf 1e15
#define mod 998244353

using namespace std;

typedef long long llint;
typedef long long ll;
typedef pair<llint, llint> P;

struct edge{
	int to, cap, cost, rev;
	edge(){}
	edge(llint a, llint b, llint c, llint d){
		to = a, cap = b, cost = c, rev = d;
	}
};

int n, m, F;
int S, T;
vector<edge> G[500005];
llint dist[500005];
int prevv[500005], preve[500005];
llint h[500005];


void BellmanFord()
{
	for(int i = 0; i <= T; i++) dist[i] = inf;
	dist[S] = 0, prevv[S] = -1;
	
	bool update = true;
	while(update){
		update = false;
		for(int i = 0; i <= T; i++){
			for(int j = 0; j < G[i].size(); j++){
				if(G[i][j].cap == 0) continue;
				if(dist[G[i][j].to] > dist[i] + G[i][j].cost){
					dist[G[i][j].to] = dist[i] + G[i][j].cost;
					prevv[G[i][j].to] = i;
					preve[G[i][j].to] = j;
					update = true;
				}
			}
		}
	}
}

void add_edge(llint from, llint to, llint cap, llint cost)
{
	G[from].push_back( edge(to, cap, cost, G[to].size()) );
	G[to].push_back( edge(from, 0, -cost, G[from].size()-1) );
}

int main(void)
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin >> n >> m;
	ll u, v, c, d;
	rep(i, 1, m){
		cin >> u >> v >> c >> d ;
		add_edge(u, v, 1, c);
		add_edge(v, u, 1, c);
		add_edge(u, v, 1, d);
		add_edge(v, u, 1, d);
	}
	S = 1, T = n;
	
	int f = 2; ll ans = 0;
	while(f > 0){
		BellmanFord();
		if(dist[T] >= inf) break;
		
		int p = T, flow = f;
		while(prevv[p] != -1){
			flow = min(flow, G[prevv[p]][preve[p]].cap);
			p = prevv[p];
		}
		
		p = T;
		while(prevv[p] != -1){
			G[prevv[p]][preve[p]].cap -= flow;
			G[p][G[prevv[p]][preve[p]].rev].cap += flow;
			p = prevv[p];
		}
		f -= flow;
		ans += dist[T] * flow;
	}
	
	if(f > 0) ans = -1;
	cout << ans << endl;
	
	return 0;
}