from collections import deque

class Unionfind:
     
    def __init__(self,n):
        self.uf = [-1]*n
 
    def find(self,x):
        if self.uf[x] < 0:
            return x
        else:
            self.uf[x] = self.find(self.uf[x])
            return self.uf[x]
 
    def same(self,x,y):
        return self.find(x) == self.find(y)
 
    def union(self,x,y):
        x = self.find(x)
        y = self.find(y)
        if x == y:
            return False
        if self.uf[x] > self.uf[y]:
            x,y = y,x
        self.uf[x] += self.uf[y]
        self.uf[y] = x
        return True
 
    def size(self,x):
        x = self.find(x)
        return -self.uf[x]

n,m = map(int,input().split())
R = [[int(x)-1 for x in input().split()] for i in range(m)]
uf = Unionfind(n)
for a,b,c in R:
    if c == 0:
        if uf.same(a,b):
            print("Yes")
            exit()
        uf.union(a,b)

e = [[] for i in range(n)]
for a,b,c in R:
    if c:
        e[uf.find(a)].append(uf.find(b))
use = [-1]*n
for i in range(n):
    if use[i] != -1:
        continue
    use[i] = i
    q = deque([i])
    while q:
        now = q.pop()
        for nex in e[now]:
            if use[nex] == i:
                print("Yes")
                exit()
            if use[nex] == -1:
                use[nex] = i
                q.append(nex)
print("No")