#include<bits/stdc++.h>
using namespace std;

int dx,dy;

bool trip(int x,int y,int c){
	if(c>3)return false;
	if(x==dx&&y==dy)return true;
	if(trip(x-2,y-1,c+1))return true;
	if(trip(x-2,y+1,c+1))return true;
	if(trip(x-1,y-2,c+1))return true;
	if(trip(x-1,y+2,c+1))return true;
	if(trip(x+1,y-2,c+1))return true;
	if(trip(x+1,y+2,c+1))return true;
	if(trip(x+2,y-1,c+1))return true;
	if(trip(x+2,y+1,c+1))return true;
	return false;
}

int main(){
	cin.tie(0),ios::sync_with_stdio(false);
	cin>>dx>>dy;
	cout<<(trip(0,0,0)?"YES"s:"NO"s)<<"\n"s;
}