#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};

struct UnionFind {
private:
    vector<int> par,ran;
    vector<int> edge,size;
    int n;
public:
    UnionFind(int x){
      n=x;
      par.resize(n,0);
      ran.resize(n,0);
      edge.resize(n,0);
      size.resize(n,1);
      rep(i,n){
        par[i]=i;
      }
    }
    int find(int x) {
        if (par[x]==x)return x;
        else return par[x]=find(par[x]);
    }
    void unite(int x, int y) {
        x=find(x),y=find(y);
        if (x==y){
            edge[x]++;
            return;
        }
        if (ran[x]<ran[y]) {
            par[x]=y;
            size[y]+=size[x];
            edge[y]+=edge[x]+1;
        }
        else {
            par[y]=x;
            size[x]+=size[y];
            edge[x]+=edge[y]+1;
            if (ran[x]==ran[y])ran[x]++;
        }
    }
    bool same(int x,int y) {
        return find(x)==find(y);
    }
    int getSize(int x){
        return size[find(x)];
    }
    int getEdge(int x){
        return edge[find(x)];
    }
};

int n,m;
vector<P> es[2];
vector<int> G[100010];
bool going[100010],backing[100010];
bool ans;

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

void solve(){
  cin >> n >> m;
  rep(i,m){
    int a,b,c;
    cin >> a >> b >> c;a--;b--;c--;
    es[c].emplace_back(a,b);
  }
  UnionFind uf(n);
  for(P e:es[0]){
    uf.unite(e.first,e.second);
  }
  rep(i,n){
    if(uf.getEdge(i)>=uf.getSize(i)){
      cout << "Yes" << endl;
      return;
    }
  }
  for(P e:es[1]){
    G[uf.find(e.first)].push_back(uf.find(e.second));
  }
  rep(i,n){
    dfs(uf.find(i));
  }
  if(ans) cout << "Yes" << endl;
  else cout << "No" << endl;
}

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