//#define _GLIBCXX_DEBUG

#include<bits/stdc++.h>
using namespace std;

#define endl '\n'
#define lfs cout<<fixed<<setprecision(10)
#define ALL(a)  (a).begin(),(a).end()
#define ALLR(a)  (a).rbegin(),(a).rend()
#define spa << " " <<
#define fi first
#define se second
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define EB emplace_back
#define rep(i,n,m) for(ll i = (n); i < (ll)(m); i++)
#define rrep(i,n,m) for(ll i = (ll)(m) - 1; i >= (ll)(n); i--)
using ll = long long;
using ld = long double;
const ll MOD1 = 1e9+7;
const ll MOD9 = 998244353;
const ll INF = 1e18;
using P = pair<ll, ll>;
template<typename T1, typename T2>bool chmin(T1 &a,T2 b){if(a>b){a=b;return true;}else return false;}
template<typename T1, typename T2>bool chmax(T1 &a,T2 b){if(a<b){a=b;return true;}else return false;}
ll median(ll a,ll b, ll c){return a+b+c-max({a,b,c})-min({a,b,c});}
void ans1(bool x){if(x) cout<<"Yes"<<endl;else cout<<"No"<<endl;}
void ans2(bool x){if(x) cout<<"YES"<<endl;else cout<<"NO"<<endl;}
void ans3(bool x){if(x) cout<<"Yay!"<<endl;else cout<<":("<<endl;}
template<typename T1,typename T2>void ans(bool x,T1 y,T2 z){if(x)cout<<y<<endl;else cout<<z<<endl;}  
template<typename T>void debug(vector<vector<T>>&v,ll h,ll w){for(ll i=0;i<h;i++){cout<<v[i][0];for(ll j=1;j<w;j++)cout spa v[i][j];cout<<endl;}};
void debug(vector<string>&v,ll h,ll w){for(ll i=0;i<h;i++){for(ll j=0;j<w;j++)cout<<v[i][j];cout<<endl;}};
template<typename T>void debug(vector<T>&v,ll n){if(n!=0)cout<<v[0];for(ll i=1;i<n;i++)cout spa v[i];cout<<endl;};
template<typename T>vector<vector<T>>vec(ll x, ll y, T w){vector<vector<T>>v(x,vector<T>(y,w));return v;}
ll gcd(ll x,ll y){ll r;while(y!=0&&(r=x%y)!=0){x=y;y=r;}return y==0?x:y;}
vector<ll>dx={1,-1,0,0,1,1,-1,-1};vector<ll>dy={0,0,1,-1,1,-1,1,-1};
template<typename T>vector<T> make_v(size_t a,T b){return vector<T>(a,b);}
template<typename... Ts>auto make_v(size_t a,Ts... ts){return vector<decltype(make_v(ts...))>(a,make_v(ts...));}
template<typename T1, typename T2>ostream &operator<<(ostream &os, const pair<T1, T2>&p){return os << p.first << " " << p.second;}
template<typename T>ostream &operator<<(ostream &os, const vector<T> &v){for(auto &z:v)os << z << " ";cout<<"|"; return os;}
template<typename T>void rearrange(vector<ll>&ord, vector<T>&v){
  auto tmp = v;
  for(int i=0;i<tmp.size();i++)v[i] = tmp[ord[i]];
}
template<typename Head, typename... Tail>void rearrange(vector<ll>&ord,Head&& head, Tail&&... tail){
  rearrange(ord, head);
  rearrange(ord, tail...);
}
//mt19937 mt(chrono::steady_clock::now().time_since_epoch().count());
int popcount(ll x){return __builtin_popcountll(x);};
int poplow(ll x){return __builtin_ctzll(x);};
int pophigh(ll x){return 63 - __builtin_clzll(x);};
struct edge {
  ll to,cost,num;
};
struct SCC{
  int n;
  const vector<vector<int>>&G;
  vector<int>index;//各ノードが属する強連結成分の番号
  vector<int>start,visited,low,ord;
  int now_ord,group_num;
  SCC(const vector<vector<int>>&g):G(g),n(g.size()){
    index.assign(n,-1LL);
    build();
  }
  void build(){
    low.assign(n,0);ord.assign(n,-1);index.assign(n,0);
    visited.reserve(n);
    now_ord=0,group_num=0;
    for(int i=0;i<n;i++){
      if(ord[i]==-1)dfs(i);
    }
    for(auto& x:index)x=group_num-1-x;
  }
  void dfs(int v){
    low[v]=ord[v]=now_ord++;
    visited.push_back(v);
    for(auto to:G[v]){
      if(ord[to]==-1){
        dfs(to);
        low[v]=min(low[v],low[to]);
      }
      else{
        low[v]=min(low[v],ord[to]);
      }
    }
    if(low[v]==ord[v]){
      while(1){
        int u=visited.back();
        visited.pop_back();
        ord[u]=n;
        index[u]=group_num;
        if(u==v)break;
      }
      group_num++;
    }

  }
  vector<vector<int>>edges;
  void build_edges(){
    edges.assign(*max_element(ALL(index))+1,vector<int>());
    for(ll i=0;i<n;i++){
      for(ll j=0;j<G[i].size();j++){
        if(index[i]!=index[G[i][j]]){
          edges[index[i]].push_back(index[G[i][j]]);
        }
      }
    }
  }
  vector<int>output(){return index;};
};
template< int mod >
struct ModInt {
  int x;

  ModInt() : x(0) {}

  ModInt(int64_t y) : x(y >= 0 ? y % mod : (mod - (-y) % mod) % mod) {}

  ModInt &operator+=(const ModInt &p) {
    if((x += p.x) >= mod) x -= mod;
    return *this;
  }

  ModInt &operator-=(const ModInt &p) {
    if((x += mod - p.x) >= mod) x -= mod;
    return *this;
  }

  ModInt &operator*=(const ModInt &p) {
    x = (int) (1LL * x * p.x % mod);
    return *this;
  }

  ModInt &operator/=(const ModInt &p) {
    *this *= p.inverse();
    return *this;
  }

  ModInt operator-() const { return ModInt(-x); }

  friend ModInt operator+(const ModInt& lhs, const ModInt& rhs) {
        return ModInt(lhs) += rhs;
  }
  friend ModInt operator-(const ModInt& lhs, const ModInt& rhs) {
        return ModInt(lhs) -= rhs;
  }
  friend ModInt operator*(const ModInt& lhs, const ModInt& rhs) {
        return ModInt(lhs) *= rhs;
  }
  friend ModInt operator/(const ModInt& lhs, const ModInt& rhs) {
        return ModInt(lhs) /= rhs;
  }

  bool operator==(const ModInt &p) const { return x == p.x; }

  bool operator!=(const ModInt &p) const { return x != p.x; }

  ModInt inverse() const {
    int a = x, b = mod, u = 1, v = 0, t;
    while(b > 0) {
      t = a / b;
      swap(a -= t * b, b);
      swap(u -= t * v, v);
    }
    return ModInt(u);
  }

  ModInt pow(int64_t n) const {
    ModInt ret(1), mul(x);
    while(n > 0) {
      if(n & 1) ret *= mul;
      mul *= mul;
      n >>= 1;
    }
    return ret;
  }

  friend ostream &operator<<(ostream &os, const ModInt &p) {
    return os << p.x;
  }

  friend istream &operator>>(istream &is, ModInt &a) {
    int64_t t;
    is >> t;
    a = ModInt< mod >(t);
    return (is);
  }

  static int get_mod() { return mod; }
};
using modint = ModInt< MOD1 >;modint pow(ll n, ll x){return modint(n).pow(x);}modint pow(modint n, ll x){return n.pow(x);}
//using modint=ld;
int main(){
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  ll res=0,buf=0;
  bool judge = true;
  ll n,m;cin>>n>>m;
  vector<vector<int>>gt(n+1);
  vector<int>u(m),v(m),l(m),a(m);
  rep(i,0,m){
    cin>>u[i]>>v[i]>>l[i]>>a[i];
    gt[u[i]].PB(v[i]);
  }
  SCC scc(gt);
  auto idx=scc.output();
  ll sz=*max_element(ALL(idx))+1;
  vector<vector<edge>>g(sz);
  rep(i,0,m){
    g[idx[u[i]]].PB({idx[v[i]],l[i],a[i]});
  }
  vector<modint>x(sz),y(sz),t(sz,-1);
  vector<int>scsz(sz);
  rep(i,0,n+1)scsz[idx[i]]++;
  t[idx[0]]=0;
  x[idx[0]]=1;
  y[idx[n]]=1;
  rep(i,0,sz){
    if(t[i]==0&&scsz[i]>=2)t[i]=1;
    for(auto e:g[i]){
      x[e.to]+=x[i]*e.num;
      if(t[i]==0&&t[e.to]==-1)t[e.to]=0;
      if(t[i]==1)t[e.to]=1;
    }
  }
  rrep(i,0,sz){
    for(auto e:g[i]){
      y[i]+=y[e.to]*e.num;
    }
  }
  if(t[idx[n]]==1)cout<<"INF"<<endl;
  else{
    modint sum=0;
    rep(i,0,m)sum+=x[idx[u[i]]]*y[idx[v[i]]]*l[i]*a[i];
    cout<<sum<<endl;
  }
  return 0;
}