#SCC参考元:https://judge.yosupo.jp/submission/22487
def scc(E):
    n = len(E)
    iE = [[] for _ in range(n)]
    for i, e in enumerate(E):
        for v in e:
            iE[v].append(i)
    T = []
    done = [0] * n # 0 -> 1 -> 2
    ct = 0
    for i0 in range(n):
        if done[i0]: continue
        Q = [~i0, i0]
        while Q:
            i = Q.pop()
            if i < 0:
                if done[~i] == 2: continue
                done[~i] = 2
                T.append(~i)
                ct += 1
                continue
            if i >= 0:
                if done[i]: continue
                done[i] = 1
            for j in E[i]:
                if done[j]: continue
                Q.append(~j)
                Q.append(j)

    done = [0] * n
    SCC = []
    for i0 in T[::-1]:
        if done[i0]: continue
        L = []
        Q = [~i0, i0]
        while Q:
            i = Q.pop()
            if i < 0:
                if done[~i] == 2: continue
                done[~i] = 2
                L.append(~i)
                continue
            if i >= 0:
                if done[i]: continue
                done[i] = 1
            for j in iE[i]:
                if done[j]: continue
                Q.append(~j)
                Q.append(j)
        SCC.append(L)
    return SCC
#================================================
import sys
from collections import defaultdict

input=sys.stdin.readline

N,M=map(int,input().split())
Mod=10**9+7

X=[[] for _ in range(N+1)]
E=[defaultdict(lambda :[0,0]) for _ in range(N+1)]

for _ in range(M):
    u,v,w,a=map(int,input().split())

    X[u].append(v)

    b,l=E[u][v]
    E[u][v]=[b+a,(l+a*w)%Mod]

S=scc(X)

inf=float("inf")
Flag=[0]*(N+1)
Flag[0]=1

DP=[[0,0] for _ in range(N+1)]
DP[0]=[1,0]

for U in S:
    if len(U)>=2:
        F=0
        for v in U:
            F|=Flag[v]

        if F:
            for v in U:
                DP[v]=[inf,inf]

    for u in U:
        x,y=DP[u]
        for v in E[u]:
            Flag[v]|=Flag[u]

            if x==inf:
                DP[v]=[inf,inf]
            else:
                a,w=E[u][v]
                DP[v][0]+=x*a
                DP[v][1]+=y*a+x*w

                DP[v][0]%=Mod
                DP[v][1]%=Mod

print(DP[N][1] if DP[N][1]<inf else "INF")