#include<bits/stdc++.h>
using namespace std;

//* ATCODER
#include<atcoder/all>
using namespace atcoder;
typedef modint998244353 mint;
//*/

/* BOOST MULTIPRECISION
#include<boost/multiprecision/cpp_int.hpp>
using namespace boost::multiprecision;
//*/

typedef long long ll;

#define rep(i, s, n) for (int i = (int)(s); i < (int)(n); i++)
#define rrep(i, s, n) for (int i = (int)(n)-1; i >= (int)(s); i--)

template <typename T> bool chmin(T &a, const T &b) {
	if (a <= b) return false;
	a = b;
	return true;
}

template <typename T> bool chmax(T &a, const T &b) {
	if (a >= b) return false;
	a = b;
	return true;
}

template <typename T> T max(vector<T> &a){
	assert(!a.empty());
	T ret = a[0];
	for (int i=0; i<(int)a.size(); i++) chmax(ret, a[i]);
	return ret;
}

template <typename T> T min(vector<T> &a){
	assert(!a.empty());
	T ret = a[0];
	for (int i=0; i<(int)a.size(); i++) chmin(ret, a[i]);
	return ret;
}

template <typename T> T sum(vector<T> &a){
	T ret = 0;
	for (int i=0; i<(int)a.size(); i++) ret += a[i];
	return ret;
}


int main(){
	int n, m; cin >> n >> m;
	vector ikeru(n, vector<int>(0));
	rep(i,0,m){
		int a, b; cin >> a >> b;
		a--; b--;
		ikeru[a].push_back(b);
		ikeru[b].push_back(a);
	}
	vector<bool> tansaku(n);
	vector<int> mada;
	vector<int> color(n);
	bool mode = 1;

	rep(st,0,n){
		if (tansaku[st]) continue;
		tansaku[st] = 1;
		mada.push_back(st);
		while(!mada.empty()){
			int i = mada.back();
			mada.pop_back();
			for (int j: ikeru[i]){
				if (!tansaku[j]){
					tansaku[j] = 1;
					mada.push_back(j);
					color[j] = color[i] ^ 1;
				}
				if (color[j] != (color[i] ^ 1)){
					mode = 0;
				}
			}
		}
	}
	if (!mode){
		cout << "No\n";
	}else{
		cout << "Yes\n";
	}
}