#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define FORD(i,b,a) for (int i = (int)(b) - 1; i >= a; --i)
#define REP(i,N) FOR(i,0,N)
#define st first
#define nd second
#define pb push_back
typedef pair<int, int> PII;
typedef long long LL;
int d[200000];
int main() {
int N, M;
scanf("%d%d", &N, &M);
REP(i,M) {
int a, b;
scanf("%d%d", &a, &b);
d[--a]++, d[--b]++;
}
REP(i,N) if (d[i]%2) {
printf("NO\n");
return 0;
}
printf("YES\n");
}