import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines
from scipy.sparse import csr_matrix
from scipy.sparse.csgraph import connected_components
import numpy as np
N, M = map(int, readline().split())
AB1 = []
AB2 = []
m = map(int, read().split())
for a, b, c in zip(m, m, m):
    if c == 1:
        AB1.append((a, b))
    else:
        AB2.append((a, b))
A1, B1 = zip(*AB1)
A2, B2 = zip(*AB2)
U = A1 + B1 + A2
V = B1 + A1 + B2
G = csr_matrix(([1] * len(U), (U, V)), (N + 1, N + 1))
_, comp = connected_components(G, directed=True, connection='strong')
comp_size = np.bincount(comp)
C = comp.max()
comp = list(comp)

n_edges = [0] * (C + 1)
for a, b in AB1 + AB2:
    ca = comp[a]
    cb = comp[b]
    if ca != cb:
        continue
    n_edges[ca] += 1

bl = any(x <= y for x, y in zip(comp_size, n_edges))
answer = 'Yes' if bl else 'No'
print(answer)