#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <climits>
#include <cmath>
#include <complex>
#include <map>
#include <set>
#include <vector>
#include <stack>
#include <queue>
#include <bitset>
#include <algorithm>
#include <numeric>
#include <functional>
#include <cassert>
#include <iomanip>
using namespace std;

#define Rep(b, e, i) for(int i = b; i <= e; i++)
#define Repr(e, b, i) for(int i = e; i >= b; i--)
#define rep(n, i) Rep(0, n-1, i)
#define repr(n, i) Repr(n-1, 0, i)
#define all(v) (v).begin(), (v).end()
#define pb(v) push_back(v)
#define uniq(v) (v).erase(unique(all(v)),(v).end())
#define bitcnt(x) __builtin_popcount(x)
#define fst first
#define snd second
#define Pqaz(T) priority_queue<T,vector<T>,greater<T>>
#define Pqza(T) priority_queue<T>
#define put(x) cout << x;
#define putsp(x) cout << x << ' ';
#define putln(x) cout << x << endl;
#define ENJYU std::ios::sync_with_stdio(false);std::cin.tie(0);

typedef long long ll;
typedef pair<ll, ll> llP;
typedef pair<int, int> intP;
typedef complex<double> comp;
typedef vector <int> vec;
typedef vector <ll> vecll;
typedef vector <double> vecd;
typedef vector <vec> mat;
typedef vector <vecll> matll;
typedef vector <vecd> matd;

//vector の中身を出力
template <class T>ostream &operator<<(ostream &o,const vector<T>&v)
{o<<"{";for(int i=0;i<(int)v.size();i++)o<<(i>0?", ":"")<<v[i];o<<"}";return o;}

const int MAX = 200000;
const double PI = 3.14159265358979323846;
const double EPS = 1e-12;
const int INF = 1<<29;
const ll INFL = 1e18;
const int MOD = 1000000007;

int dx4[4]={1,0,-1,0};
int dy4[4]={0,1,0,-1};
int dx8[8]={1,0,-1,1,-1,1,0,-1};
int dy8[8]={1,1,1,0,0,-1,-1,-1};

//********************************template END****************************************//

struct UnionFind {
	//number of parents(par[i] = i => root)
	vector <int> par;
	//rank of tree
	vector <int> rank;

	UnionFind(int n) : par(n), rank(n, 1) {
		//initialize
		rep(n, i) par[i] = i;
	}

	//find root (keiroasshuku at the same time)
	int root(int x){
		if (par[x] == x) return x;
		else return par[x] = root(par[x]);
	}

	//unite
	void unite(int x, int y){
		x = root(x);
		y = root(y);
		if (x == y) return;
		if (rank[x] > rank[y]) swap(x, y);
		par[x] = y;
		if (rank[x] == rank[y]) rank[y]++;
	}

	//same tree?
	bool same(int x, int y){
		return root(x) == root(y);
	}
};


void solve(void){

	int N, M;
	cin >> N >> M;

	vec ms(2*M);

	map <int, int> mp;

	UnionFind uf(N);

	rep(M, i)
	{
		cin >> ms[2*i] >> ms[2*i+1];
		ms[2*i], ms[2*i+1];
		mp[ms[2*i]]++;
		mp[ms[2*i+1]]++;
		uf.unite(ms[2*i], ms[2*i+1]);
	}

	int cnt = 0;

	for (auto p : mp)
	{
		cnt += p.snd & 1;
	}

	rep(2*M, i)
	{
		if (uf.same(ms[i], ms[0]))
		{
			continue;
		}
		cout << "NO" << endl;
		return;
	}

	cout << (cnt == 2 || cnt == 0 ? "YES" : "NO") << endl;

}

int main(void){
	solve();
	//cout << "yui(*-v・)yui" << endl;
	return 0;
}