#define _GLIBCXX_DEBUG
#include<bits/stdc++.h>
using namespace std;
#define rep(i,x) for(ll i = 0; i < (ll)(x); i++)
#define rrep(i,x) for(ll i = (ll)(x)-1;0 <= i; i--)
#define reps(i,x) for(ll i = 1; i < (ll)(x)+1; i++)
#define rreps(i,x) for(ll i = (ll)(x); 1 <= i; i--)
#define debug(x) cerr << #x << ": " << (x) << "\n";
#define all(x) (x).begin(), (x).end()
typedef long long ll;
typedef long double ld;
typedef pair<int,int> P;
typedef pair<ll,ll> Pll;
typedef vector<ll> vl;
typedef vector<vector<ll>> vvl;
typedef vector<vector<vector<ll>>> vvvl;
const ll INF = numeric_limits<ll>::max()/4;
const int n_max = 1e5+10;
#define int ll

//頂点fromから頂点toへのコストcostの辺
template<typename T>
struct edge{
    int f,t;
    T c;
    int id;
    edge(){};
    edge(int f,int t,T c,int id = 0):f(f),t(t),c(c),id(id){};
    bool operator< (const edge &s){
        return c < s.c;
    }
};

template<typename T>
struct graph{
    std::vector<std::vector<edge<T> > > data;
    graph(int v):data(v){};
    void add_edge(edge<T> &e){
        data[e.f].push_back(e);
    }
    void add_edge(int f,int t,T c){
        data[f].emplace_back(f,t,c);
    }
    size_t size(){
        return data.size();
    }
    std::vector<edge<T>> make_edges(){
        std::vector<edge<T>> r;
        for(auto &i:data)std::copy(i.begin(),i.end(),std::back_inserter(r));
        return r;
    }
};

vector<int> is_moved(n_max,0);

template<typename T>
void reach(graph<T> &g, int pos){
    is_moved[pos] = 1;
    for(auto i : g.data[pos]){
        if(!is_moved[i.t]){
            reach(g, i.t);
        }
    }
}

template<typename T>
std::vector<T> bellmanford(graph<T> &g, int s){
    const T INF = std::numeric_limits<T>::max()/4;
    std::vector<T> data(g.size(),INF);
    data[s] = 0;
    for(int i=0;i<g.size()-1;i++){
        for(auto &v:g.data)for(auto &e:v){
            if(data[e.f]==INF)continue;
            data[e.t] = std::min(data[e.f] + e.c,data[e.t]);
        }
    }
    for(auto &v:g.data)for(auto &e:v){
        if(data[e.f]==INF)continue;        
        if(data[e.f] + e.c < data[e.t]){
            // fill(data.begin(),data.end(),std::numeric_limits<T>::min());
            fill(is_moved.begin(),is_moved.end(),0);
            reach(g,e.f);
            for(T i = 0; i < g.data.size();i++){
                if(is_moved[i])data[i] = -INF;
            }
            break;
        }
    }
    return data;
};

void print() {
    cout << endl;
}

template <class Head, class... Tail>
void print(Head&& head, Tail&&... tail) {
    cout << head;
    if (sizeof...(tail) != 0) cout << ' ';
    print(forward<Tail>(tail)...);
}

template <class T>
void print(vector<T> &vec) {
    for (auto& a : vec) {
        cout << a;
        if (&a != &vec.back()) cout << ' ';
    }
    cout << endl;
}

template <class T>
void print(vector<vector<T>> &df) {
    for (auto& vec : df) {
        print(vec);
    }
}

template<class T, class U>
void print(pair<T,U> &p){
    print(p.first, p.second);
}


signed main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    
    ll n,m; cin >> n >> m;
    graph<ll> g(n);
    rep(i,m) {
        ll a,b,c; cin >> a >> b >> c;
        a--;b--;
        if(c == 1){
            g.add_edge(a, b, -1);
            g.add_edge(b, a, 1);
        }
        else{
            g.add_edge(a, b, -1);
        }
    }
    auto vec = bellmanford(g, 0);
    // print(vec);
    cout << (*min_element(all(vec)) == -INF ? "Yes" : "No") << endl;
}