#include <iostream>
#include <stack>
#include <string.h>
#include <vector>

using namespace std;
typedef long long ll;

const ll MOD = 1000000007;

typedef vector <vector<int>> Graph;
typedef vector <vector<ll>> Cost;
typedef vector <vector<ll>> Nums;

vector<int> tsort(Graph G, int start, int end) {
  vector<int> ret;

  int degree[end];
  memset(degree, 0, sizeof(degree));

  for (int from = start; from < end; from++) {
    for (int i = 0; i < G[from].size(); i++) {
      int to = G[from][i];
      degree[to]++;
    }
  }

  stack<int> root;

  for (int i = start; i < end; i++) {
    if (degree[i] == 0) {
      root.push(i);
    }
  }

  while (!root.empty()) {
    int from = root.top();
    root.pop();

    ret.push_back(from);

    for (int i = 0; i < G[from].size(); i++) {
      int to = G[from][i];
      degree[to]--;

      if (degree[to] == 0) {
        root.push(to);
      }
    }
  }

  return ret;
}

int main() {
  int N, M;
  cin >> N >> M;

  Graph G(N + 1);
  Cost C(N + 1);
  Nums D(N + 1);

  int s, t;
  ll l, a;

  for (int i = 0; i < M; ++i) {
    cin >> s >> t >> l >> a;

    G[s].push_back(t);
    C[s].push_back(l);
    D[s].push_back(a);
  }

  vector<int> res = tsort(G, 0, N + 1);

  if (res.size() != N + 1) {
    // tsort failed.
    cout << "INF" << endl;
  } else {
    ll dp_C[N + 1];
    ll dp_D[N + 1];
    memset(dp_C, 0, sizeof(dp_C));
    memset(dp_D, 0, sizeof(dp_D));
    dp_D[0] = 1;

    for (int v : res) {
      int L = G[v].size();

      for (int i = 0; i < L; ++i) {
        int u = G[v][i];
        ll c = C[v][i];
        ll d = D[v][i];

        dp_C[u] += dp_C[v] + dp_D[v] * d * c;
        dp_D[u] += dp_D[v] * d;
        dp_C[u] %= MOD;
        dp_D[u] %= MOD;
      }
    }

    cout << dp_C[N] << endl;
  }

  return 0;
}