#define ll long long
#define ffor(i,a,b) for (int i=(a);i<(b);i++)
#define rfor(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define rep(i,n) for (int i=0;i<(n);i++)
#define rrep(i,n) for (int i=(n)-1;i>=0;i--)
#include<iostream>
#include<iomanip>
#include<algorithm>
#include<cmath>
#include<string>
#include<stack>
#include<queue>
#define SIZE 100001
#define MOD 1000000007
#define INF 100000000
using namespace std;

typedef pair<int,int> P;

int dx[8] = {-2,-2,-1,-1,1,1,2,2};
int dy[8] = {-1,1,-2,2,-2,2,-1,1};

int main(){
	int flag = 0;
	int x,y;
	cin >> x >> y;

	queue <P> q;
	queue <int> num;
	q.push(P(0,0));
	num.push(0);

	while(!q.empty()){
		P now = q.front();
		int count = num.front();
		q.pop();
		num.pop();

		if(count >= 3) continue;

		rep(i,8){
			int a = now.first + dx[i];
			int b = now.second + dy[i];
			if(a == x && b == y){
				flag = 1;
				break;
			}
			q.push(P(a,b));
			num.push(count+1);
		}
	}

	cout << ((flag==1)? "YES":"NO") << endl;


	return 0;
}