import sys
input = sys.stdin.buffer.readline
sys.setrecursionlimit(10 ** 7)


class UF_tree:
    def __init__(self, n):
        self.root = [-1] * (n + 1)
        self.rank = [0] * (n + 1)

    def find(self, x):
        if self.root[x] < 0:
            return x
        else:
            self.root[x] = self.find(self.root[x])
            return self.root[x]

    def isSame(self, x, y):
        return self.find(x) == self.find(y)

    def unite(self, x, y):
        x = self.find(x)
        y = self.find(y)
        if x == y:
            return False
        elif self.rank[x] < self.rank[y]:
            self.root[y] += self.root[x]
            self.root[x] = y
        else:
            self.root[x] += self.root[y]
            self.root[y] = x
            if self.rank[x] == self.rank[y]:
                self.rank[x] += 1
        return True

    def size(self, x):
        return -self.root[self.find(x)]


def main():
    N, M = map(int, input().split())
    uf = UF_tree(N)
    edge = []
    for _ in range(M):
        a, b, c = map(int, input().split())
        a -= 1
        b -= 1
        if c == 1:
            if not uf.unite(a, b):
                return True
        else:
            edge.append((a, b))

    G = [[] for _ in range(N)]
    deg = [0] * N
    for a, b in edge:
        a = uf.find(a)
        b = uf.find(b)
        if a == b:
            return True
        deg[b] += 1
        G[a].append(b)

    # トポロジカル順が出来れば閉路なし
    que = []
    for i, d in enumerate(deg):
        if not d:
            que.append(i)
    topo = []
    while que:
        s = que.pop()
        topo.append(s)
        for t in G[s]:
            deg[t] -= 1
            if not deg[t]:
                que.append(t)
    return len(topo) != N


if main():
    print("Yes")
else:
    print("No")