#include <iostream>
#include <vector>
using namespace std;
typedef long long LL;
int X,Y;
bool Check(vector<pair<int,int>> &myVec,int x,int y)
{
	myVec.push_back(make_pair(x-2,y-1));
	myVec.push_back(make_pair(x-2,y+1));
	myVec.push_back(make_pair(x-1,y-2));
	myVec.push_back(make_pair(x-1,y+2));
	myVec.push_back(make_pair(x+1,y-2));
	myVec.push_back(make_pair(x+1,y+2));
	myVec.push_back(make_pair(x+2,y-1));
	myVec.push_back(make_pair(x+2,y+1));
	int i;
	for (i=0;i<myVec.size();i++){
		if (myVec[i].first==X && myVec[i].second==Y){
			myVec.clear();
			cout<<"YES"<<endl;
			return true;
		}
	}
	return false;
}
bool canGoTo(int x,int y)
{
	if (x==X && y==Y){
		cout<<"YES"<<endl;
		return true;
	}
	vector<pair<int,int>> myVec1;
	bool canGo=Check(myVec1,x,y);
	if (canGo){
		return true;
	}
	vector<pair<int,int>> myVec2;
	int i;
	for (i=0;i<myVec1.size();i++){
		canGo=Check(myVec2,myVec1[i].first,myVec1[i].second);
		if (canGo==true){
			return true;
		}	
	}
	vector<pair<int,int>> myVec3;
	for (i=0;i<myVec2.size();i++){
		canGo=Check(myVec3,myVec2[i].first,myVec2[i].second);
		if (canGo==true){
			return true;
		}	
	}
	myVec1.clear();
	myVec2.clear();
	myVec3.clear();
	cout<<"NO"<<endl;
	return false;
}
int main(int argc, char* argv[])
{
	cin>>X>>Y;
	canGoTo(0,0);
	return 0;
}