mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.buffer.readline

    N, M = map(int, input().split())
    LR0 = []
    LR1 = []
    imos0 = [0] * (N + 2)
    imos1 = [0] * (N + 2)
    for _ in range(M):
        l, r, p = map(int, input().split())
        if p == 0:
            LR0.append((l, r))
            imos0[l] += 1
            imos0[r+1] -= 1
        else:
            LR1.append((l, r))
            imos1[l] += 1
            imos1[r+1] -= 1
    seg0 = [0] * (N+1)
    seg1 = [0] * (N+1)
    F = 0
    N1 = 0
    dp = [0] * (N+1)
    dp[0] = 1
    LR0.sort(key=lambda x: x[1], reverse=True)
    RmostL = -1
    S = [0] * (N+1)
    cnt = [0] * (N+1)
    for i in range(N):
        seg0[i+1] = seg0[i] + imos0[i+1]
        seg1[i+1] = seg1[i] + imos1[i+1]
        if seg0[i+1] == seg1[i+1] == 0:
            F += 1
            dp[i+1] = dp[i]
            cnt[i+1] = cnt[i]
            S[i+1] = S[i]
        elif seg1[i+1] == 0:
            if LR0:
                if LR0[-1][1] == i+1:
                    l, r = LR0.pop()
                    RmostL = max(RmostL, l)
            dp[i+1] = (dp[i] + S[i] - (S[RmostL] * pow(2, cnt[i] - cnt[RmostL]))%mod)%mod
            S[i+1] = (S[i]*2 + dp[i+1])%mod
            cnt[i+1] = cnt[i]+1
        else:
            N1 += 1
            dp[i+1] = dp[i]
            cnt[i+1] = cnt[i]
            S[i+1] = S[i]

    # min
    def STfunc(a, b):
        if a < b:
            return a
        else:
            return b

    # クエリは0-indexedで[l, r)
    class SparseTable():
        def __init__(self, A):
            # A: 処理したい数列
            self.N = len(A)
            self.K = self.N.bit_length() - 1
            self.table = [0] * (self.N * (self.K + 1))
            for i, a in enumerate(A):
                self.table[i] = a
            for k in range(1, self.K + 1):
                for i in range(self.N):
                    j = i + (1 << (k - 1))
                    if j <= self.N - 1:
                        self.table[i + k * self.N] = STfunc(self.table[i + (k - 1) * self.N],
                                                            self.table[j + (k - 1) * self.N])

        def query(self, l, r):
            # [l, r)の最小値を求める
            k = (r - l).bit_length() - 1
            return STfunc(self.table[l + k * self.N], self.table[r - (1 << k) + k * self.N])

    if seg1:
        ST = SparseTable(seg1)
        for l, r in LR0:
            if ST.query(l, r+1) > 0:
                print(0)
                exit()

    print(((dp[-1] * pow(3, F, mod))%mod * pow(2, N1 - len(LR1), mod))%mod)


if __name__ == '__main__':
    main()