from collections import deque
n, m=map(int, input().split())
par=[i for i in range(n)]
sz=[1]*n
def find(x):
    if x==par[x]:
        return x
    par[x]=find(par[x])
    return par[x]
def unite(x, y):
    x=find(x)
    y=find(y)
    if x==y:
        return False
    if sz[x]>sz[y]:
        x, y=y, x
    sz[y]+=sz[x]
    par[x]=y
    return True
e=[]
for _ in range(m):
    a, b, c=map(int, input().split())
    a-=1
    b-=1
    if c==1:
        if not unite(a, b):
            print("Yes")
            exit()
    else:
        e.append((a, b))
g=[[] for i in range(n)]
deg=[0]*n
for p in e:
    x=find(p[0])
    y=find(p[1])
    g[x].append(y)
    deg[y]+=1
que=deque()
for x in range(n):
    if deg[x]==0:
        que.appendleft(x)
while len(que)!=0:
    x=que.popleft()
    for y in g[x]:
        deg[y]-=1
        if deg[y]==0:
            que.appendleft(y)
for x in range(n):
    if deg[x]>0:
        print("Yes")
        exit()
print("No")