import sys
def input():
	return sys.stdin.buffer.readline()[:-1]

MOD = 10**9+7
n, m = map(int, input().split())
two_pow = [1 for _ in range(n+2)]
for i in range(1, n+2):
	two_pow[i] = (two_pow[i-1] * 2) % MOD

zero_seg = [0 for _ in range(n+1)]
nonzero_num = 0
nonzero_imos = [0 for _ in range(n+2)]
for _ in range(m):
	l, r, p = map(int, input().split())
	if p == 0:
		zero_seg[r] = l
	else:
		nonzero_num += 1
		nonzero_imos[l] += 1
		nonzero_imos[r+1] -= 1

for i in range(2, n+2):
	nonzero_imos[i] += nonzero_imos[i-1]

dp = [0 for _ in range(n+1)]
cum = [0 for _ in range(n+2)]
dp[0] = 1
cum[0] = 1
max_left = 0

for i in range(1, n+1):
	if nonzero_imos[i] == 0:
		dp[i] = (cum[i-1] - two_pow[i-max_left] * cum[max_left-1]) % MOD
	cum[i] = (2*cum[i-1] + dp[i]) % MOD
	max_left = max(max_left, zero_seg[i])

pre_ans = (cum[n] - two_pow[n-max_left+1] * cum[max_left-1]) % MOD
ans = (pre_ans * pow(500000004, nonzero_num, MOD)) % MOD
print(ans)