n, q = map(int, input().split())
g = [ list() for i in range(n) ]
for i in range(q):
	a, b, c = map(int, input().split())
	a, b = a - 1, b - 1
	g[a].append((b, c))
	g[b].append((a, c))

col = [ -1 ] * n
answer = 1
for i in range(n):
	if col[i] == -1:
		v = [ i ]
		col[i] = 0
		while v:
			u = v.pop()
			for b, c in g[u]:
				if col[b] == -1:
					col[b] = col[u] ^ c
					v.append(b)
				elif col[b] != col[u] ^ c:
					answer = 0
		answer = answer * 2 % 998244353

print(answer)