#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define ALL(v) v.begin(), v.end()
typedef long long ll;

#include <bits/stdc++.h>
using namespace std;
using Graph=vector<vector<int>>;

vector<int> color;
bool dfs(const Graph &G,int v,int cur=0){
  color[v]=cur;
  for(auto next_v:G[v]){
    if(color[next_v]!=-1){
      if(color[next_v]==cur) return false;
      continue;
    }
    if(!dfs(G,next_v,1-cur)) return false;
  }
  return true;
}

int main(){
  int n,m;
  cin>>n>>m;
  
  Graph G(n);
  rep(i,m){
    int a,b;
    cin>>a>>b;
    a--,b--;
    G[a].push_back(b);
    G[b].push_back(a);
  }
  
  color.assign(n,-1);
  bool b=true;
  rep(v,n){
    if(color[v]!=-1) continue;
    if(!dfs(G,v)) b=false;
  }
  if(b) cout<<"Yes"<<endl;
  else cout<<"No"<<endl;

  return 0;
}