#include <bits/stdc++.h>
#include <atcoder/all>
using namespace atcoder;
#define rep(i, n) for (int i = 0; i < (n); ++i)

using namespace std;
using ll = long long;

int main() {
    int n, m;
    cin >> n >> m;
    
    mcf_graph<int, ll> g(n);
    rep(i, m) {
        int u, v, c, d;
        cin >> u >> v >> c >> d;
        --u; --v;
        g.add_edge(u, v, 1, c);
        g.add_edge(u, v, 1, d);
        g.add_edge(v, u, 1, c);
        g.add_edge(v, u, 1, d);
    }
    
    auto f = g.flow(0, n-1, 2);
    cout << f.second << '\n';
    
    return 0;
}