#include<bits/stdc++.h>
using namespace std;
long long s,t;
int main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
	cin>>s>>t;
	if(t==0)
		s=1;
	if(s<0)
		cout<<"YES\n";
	else
		cout<<"NO\n";
	if(s%2==0)
		cout<<"NO";
	else
		cout<<"YES";
    return 0;
}