#include <iostream>
#include <cstdio>
#include <vector>
#define _USE_MATH_DEFINES
#include <math.h>
#include <cstring>
#include <numeric>
#include <algorithm>
#include <stdlib.h>
#include <functional>
#include <string>
#include <list>
#include <fstream>
#include <iomanip>
#include <array>
#include <map>
#include <queue>
#include <limits.h>
#include <set>
#include <stack>
#include <random>
#include <complex>
#include <unordered_map>
#include <unordered_set>
#include <nmmintrin.h>
#include <chrono>
#define rep(i,s,n) for(int i = (s); (n) > i; i++)
#define REP(i,n) rep(i,0,n)
#define RANGE(x,a,b) ((a) <= (x) && (x) <= (b))
#define DUPLE(a,b,c,d) (RANGE(a,c,d) || RANGE(b,c,d) || RANGE(c,a,b) || RANGE(d,a,b))
#define INCLU(a,b,c,d) (RANGE(a,c,d) && (b,c,d))
#define PW(x) ((x)*(x))
#define ALL(x) (x).begin(), (x).end()
#define MODU 1000000007
#define bitcheck(a,b)   ((a >> b) & 1)
#define bitset(a,b)      ( a |= (1 << b))
#define bitunset(a,b)    (a &= ~(1 << b))
#define MP(a,b) make_pair((a),(b))
#define Manh(a,b) (abs((a).first-(b).first) + abs((a).second - ((b).second))
#define pritnf printf
#define scnaf scanf
#define itn int
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
ll gcd(ll a, ll b) {
	if (b == 0) return a;
	return gcd(b, a%b);
}
template<typename A, size_t N, typename T>
void Fill(A(&array)[N], const T &val) {
	std::fill((T*)array, (T*)(array + N), val);
}

struct Edge {
	int from, to;
	ll weight;

	bool operator < (const Edge& obj) const {
		return weight < obj.weight;
	}
	bool operator > (const Edge& obj) const {
		return weight > obj.weight;
	}
};


struct Lazyseg {
	int n;
	vector<ll> x, laz;
	vector<int> r;

	Lazyseg(int _n) {
		n = 1;
		while (_n > n) n *= 2;

		x.resize(n * 2);
		laz.resize(n * 2);

		r.resize(n);
	}

	void upd(int k, int a, int b) {
		if (laz[k] == 0) return;

		x[k] = r[b] - r[a] - x[k];
		laz[k] = 0;
		if (k < n) {
			laz[k * 2] ^= 1;
			laz[k * 2 + 1] ^= 1;
		}
	}

	void xr(int l, int r, int k = 1, int a = 0, int b = -1) {
		if (b == -1) b = n;

		if (l >= r) return;

		upd(k, a,b);
		if (l == a && r == b) {
			laz[k] ^= 1;
			upd(k, a, b);
			return;
		}
		int mid = (a + b) / 2;

		if (l < mid) xr(l, min(mid, r), k * 2, a, mid);
		if (mid < r) xr(max(mid, l), r, k * 2 + 1, mid, b);

		upd(k, a,b);
		upd(k * 2, a, mid);
		upd(k * 2 + 1, mid, b);

		x[k] = x[k * 2] + x[k * 2 + 1];
	}

	ll sum(int l, int r, int k = 1, int a = 0, int b = -1) {
		if (b == -1) b = n;

		if (l >= r) return 0;

		upd(k, a, b);
		if (l == a && r == b) {
			upd(k, a,b);
			return x[k];
		}
		int mid = (a + b) / 2;
		ll ret = 0;
		if (l < mid) ret += sum(l, min(mid, r), k * 2, a, mid);
		if (mid < r) ret += sum(max(mid, l), r, k * 2 + 1, mid, b);

		upd(k, a, b);
		return ret;
	}
};

class Bitvector {
	//4byteブロック 全部半径、0-index
	const int bsize = 8;
	static const int popc[256];
public:

	unsigned char* st;
	unsigned int* blockrank;
	int sz;
	Bitvector(int n) {
		sz = n;
		st = (unsigned char*)calloc((n + bsize - 1) / bsize, sizeof(char));
		blockrank = (unsigned int*)calloc((n + bsize - 1) / bsize + 1, sizeof(int));
		if (st == NULL || blockrank == NULL)
			abort();
	}
	inline void set(int a, bool f) {//後から追加はできない
		if (f)bitset(st[a / bsize], (bsize - 1 - a % bsize));
	}
	inline bool get(int a) { return bitcheck(st[a / bsize], (bsize - 1 - a % bsize)); }
	inline void calcblock() {
		int cou = 0;
		REP(i, sz + 1) {
			if (i && !(i % 8))blockrank[i / bsize] = cou;
			if (i<sz)cou += bitcheck(st[i / bsize], (bsize - 1 - i % bsize));
		}
	}
	int rank(int a, bool t) {
		int ret = blockrank[a / bsize] + (((bsize - a % bsize) >= bsize) ? 0 : popc[st[a / bsize] >> (bsize - a % bsize)]);
		return t ? ret : a - ret;
	}
	int select(int a, bool t) {
		int l = 0, r = sz + 1;

		while (r - l > 1) {
			int mid = (l + r) / 2;
			if (rank(mid, t) >= a) r = mid;
			else l = mid;
		}
		if (rank(r, t) < a) return -1;
		return r;
	}
	void clear() {
		free(st);
		free(blockrank);
	}
};
const int Bitvector::popc[256] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8 };

//プリミティブ型だけだよ！！！！(低レベルでうぇぶるので) 数値比較系使うときはunsignedのみ！！！！！
template<typename T>
class WaveletMatrix {
#define tbitcheck(a,b)   (((T)a >> b) & 1)
#define tbitset(a,b)      ( a |= ((T)1 << b))
#define tbitunset(a,b)    (a &= ~((T)1 << b))
public:
	vector<T> data;
	vector<ll> rui;
	vector<vector<ll>> bitrui;
	vector<Bitvector> bitv;
	vector<int> border;
	int bitsize;

	WaveletMatrix(vector<T>& dat) : bitsize(sizeof(T) * 8), data(dat), border(sizeof(T) * 8 + 1), rui(data.size() + 1), bitrui(sizeof(T) * 8) {
		bitv.reserve(bitsize);
		REP(i, bitsize + 1)
			bitv.push_back(Bitvector(data.size()));

		REP(j, data.size()) {
			bitv[0].set(j, tbitcheck(data[j], bitsize - 1));
			rui[j + 1] = rui[j] + data[j];
		}
		bitv[0].calcblock();
		vector<T> buf[2];
		buf[0] = data;
		buf[1].resize(data.size());

		REP(i, bitsize - 1) {
			border[i + 1] = bitv[i].rank(data.size(), 0);
			int cou[2] = { 0, border[i + 1] };
			bitrui[i].resize(data.size() + 1);
			REP(j, data.size()) {

				if (tbitcheck(buf[i % 2][j], bitsize - i - 1))
					bitrui[i][j + 1] = buf[i % 2][j];
				bitrui[i][j + 1] += bitrui[i][j];

				bitv[i + 1].set(cou[bitv[i].get(j)], tbitcheck(buf[i % 2][j], bitsize - i - 2));
				buf[1 - i % 2][cou[bitv[i].get(j)]] = tbitunset(buf[i % 2][j], (bitsize - i - 1));
				cou[bitv[i].get(j)]++;
			}
			bitv[i + 1].calcblock();
		}
		bitrui[bitsize - 1].resize(data.size() + 1);
		REP(j, data.size()) {
			if (tbitcheck(buf[(bitsize - 1) % 2][j], 0))
				bitrui[bitsize - 1][j + 1] = buf[(bitsize - 1) % 2][j];
			bitrui[bitsize - 1][j + 1] += bitrui[bitsize - 1][j];
		}
		border[bitsize] = bitv[bitsize - 1].rank(data.size(), 0);
	}

	pii search(int s, int e, unsigned int t, int b = 0) {
		if (b == bitsize) return{ s,e };
		bool cur = tbitcheck(t, bitsize - 1);
		return search(cur*border[b + 1] + bitv[b].rank(s, cur), cur*border[b + 1] + bitv[b].rank(e, cur), t << 1, b + 1);
	}
	int backward(int a, unsigned int t, int b = 0) {
		if (b == bitsize - 1) return a;
		backward(bitv[bitsize - b - 1].select(a + 1 - tbitcheck(t, 0) * border[bitsize - b], tbitcheck(t, 0)) - 1, t >> 1, b + 1);
	}

	int rank(int s, int e, T t) {
		pii r = search(s, e, t);
		return r.second - r.first;
	}

	int select(int a, T t) {
		pii r = search(0, data.size(), t);
		return  backward(r.first + a - 1, t);
	}

	T less_kthelement(int s, int e, int k, int b = 0) {//小さいほうから 0番目~
		int eo = bitv[b].rank(e, 0), so = bitv[b].rank(s, 0), cou = eo - so;
		if (b == bitsize - 1) return cou <= k;
		return (cou <= k ?
			less_kthelement(border[b + 1] + (s - so), border[b + 1] + (s - so) + (e - s - cou), k - cou, b + 1) :
			less_kthelement(so, so + cou, k, b + 1)) | ((cou <= k) << (bitsize - b - 1));
	}

	T more_kthelement(int s, int e, int k, int b = 0) {//上からk個のsum 0番目~
		int eo = bitv[b].rank(e, 1), so = bitv[b].rank(s, 1), cou = eo - so;
		if (b == bitsize - 1) return cou > k;
		return (cou > k ?
			more_kthelement(border[b + 1] + so, border[b + 1] + so + cou, k, b + 1) :
			more_kthelement(s - so, (s - so) + (e - s - cou), k - cou, b + 1)) | ((cou > k) << (bitsize - b - 1));
	}

	ll more_kthsum(int s, int e, int k, int b = 0) {//大きいほうからk個
		if (k <= 0) return 0;
		int eo = bitv[b].rank(e, 1), so = bitv[b].rank(s, 1), cou = eo - so;
		if (b == bitsize - 1) return min(k, cou);

		if (cou >= k) {
			ll  ret = more_kthsum(border[b + 1] + so, border[b + 1] + so + cou, k, b + 1);
			return ret + (ll)min(k, cou) * (1 << (bitsize - b - 1));
		}
		else {
			ll ret = more_kthsum(s - so, (s - so) + (e - s - cou), k - cou, b + 1);
			return ret + (bitrui[b][e] - bitrui[b][s]) + (ll)min(k, max(0, cou - k)) * (1 << (bitsize - b - 1));
		}
	}
	ll less_kthsum(int s, int e, int k, int b = 0) {//小さいほうからk個

		return (rui[e] - rui[s]) - more_kthsum(s, e, (e - s) - k);
	}

	int less(int s, int e, T t, int b = 0) {
		int eo = bitv[b].rank(e, 0), so = bitv[b].rank(s, 0), cou = (eo - so);
		if (b == bitsize) return e - s;
		return tbitcheck(t, bitsize - b - 1) ?
			less(border[b + 1] + (s - so), border[b + 1] + (s - so) + (e - s - cou), t, b + 1) + cou :
			less(so, so + cou, t, b + 1);
	}

	~WaveletMatrix() {
		REP(i, bitsize) bitv[i].clear();
	}
};
int main()
{

	int n, m;
	cin >> n >> m;
	int co[100001] = {};
	REP(i, m) {
		int a, b;
		scnaf("%d %d", &a, &b);
		co[a]++;
		co[b]++;
	}
	REP(i, n + 1) {
		if (co[i] % 2) {
			cout << "NO" << endl;
			return 0;
		}
	}
	cout << "YES" << endl;
	return 0;
}


Measured memory_bytes: 640