#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<complex>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
#include<tuple>
using namespace std;
typedef long long ll;
typedef unsigned int ui;
const ll mod = 1000000007;
const ll INF = (ll)1000000007 * 1000000007;
typedef pair<int, int> P;
#define stop char nyaa;cin>>nyaa;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define Per(i,sta,n) for(int i=n-1;i>=sta;i--)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define per1(i,n) for(int i=n;i>=1;i--)
#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)
typedef long double ld;
const ld eps = 1e-8;
const ld pi = acos(-1.0);
typedef pair<ll, ll> LP;
int dx[4]={1,-1,0,0};
int dy[4]={0,0,1,-1};

int n,m;
vector<int> G[100010];
map<P,int> E;
bool going[100010],backing[100010];
bool ans=false;

void dfs(int s,int par){
  going[s]=true;
  for(int t:G[s]){
    if(t==par) continue;
    if(going[t] && !backing[t]) {
      ans=true;
      return;
    }
    if(going[t]) continue;
    dfs(t,s);
  }
  backing[s]=true;
}

void solve(){
  cin >> n >> m;
  rep(i,m){
    int a,b,c;cin >> a >> b >> c;a--;b--;c--;
    if(c==0){
      G[a].push_back(b);
      G[b].push_back(a);
    }
    if(c==1){
      G[a].push_back(b);
    }
    if(a>b) swap(a,b);
    E[P(a,b)]+=1; 
  }
  for(auto e:E){
    if(e.second>=2){
      cout << "Yes" << endl;
      return;
    }
  }
  rep(i,n){
    dfs(i,-1);
  }
  if(ans) cout << "Yes" << endl;
  else cout << "No" << endl; 
}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << fixed << setprecision(50);
    solve();
}