#include<iostream>
using namespace std;
long long y0,t;
int main()
{
	cin>>y0>>t;
	if(t==0) cout<<"NO"<<"\n"<<"YES";
	else 
	{
		if(y0>=0)
		{
			cout<<"NO"<<"\n";
		}
		else
		{
			if(t%2==0) cout<<"NO"<<"\n";
			else cout<<"YES"<<"\n";
		}
		if(y0%2==1) cout<<"YES"<<"\n";
		else cout<<"NO"<<"\n"; 
	}
	
	return 0;
}