class Bit:
    def __init__(self, n):
        self.size = n
        self.tree = [0] * (n + 1)

    def sum(self, i):
        s = 0
        while i > 0:
            s += self.tree[i]
            i -= i & -i
        return s

    def add(self, i, x):
        while i <= self.size:
            self.tree[i] += x
            i += i & -i

N, M = map(int, input().split())
mod = 10**9+7
A = [0] * (N+1)
r2l = [0] * (N+1)
c = 0
for _ in range(M):
    l, r, p = map(int, input().split())
    if p:
        A[l-1] += 1
        A[r] -= 1
        c += 1
    else:
        r2l[r] = l

bt = Bit(N+1)
bt.add(1, pow(2, N, mod))
mxl = 0
m2=500000004
for i in range(1, N+1):
    A[i] += A[i-1]
    if A[i-1] == 0:
        bt.add(i+1, pow(2, N-i, mod)*pow(m2, N-i+1, mod)*(bt.sum(i) - bt.sum(mxl))%mod)
    mxl = max(mxl, r2l[i])
print((bt.sum(N+1)-bt.sum(mxl))*pow(m2, c, mod)%mod)