#include<bits/stdc++.h>
using namespace std;
long long int n,t;
int main()
{
	cin>>n>>t;
	if(t==0)
	{
		cout<<"NO"<<endl<<"YES";
		return 0;
	}
	if(n%2!=0&&n>0)
	{
		cout<<"NO"<<endl<<"YES";
		return 0;
	}
	if(n%2!=0&&n<0)
	{
		if(t%2==0)
			cout<<"YES"<<endl<<"YES";
		else
			cout<<"NO"<<endl<<"YES";
		return 0;
	}
	if(n%2==0&&n>0)
	{
		cout<<"NO"<<endl<<"NO";
		return 0;
	}
	if(n%2==0&&n<0)
	{
		if(t%2==0)
			cout<<"YES"<<endl<<"NO";
		else
			cout<<"NO"<<endl<<"NO";
		return 0;
	}
	return 0;
}