#include <iostream>
using namespace std;

int main() {
	double x,y;
	cin>>x>>y;
	if ((x>=0 && y>=0 && (x+y)<=6)||(x<=0 && y<=0 && (x+y)>=-6))
	cout<<"Yes"<<endl;
	else 
	cout<<"No"<<endl;
	return 0;
}