//B3677 [语言月赛202211] Fear
#include<iostream>
#include<algorithm>
#include<cmath>
#define ll long long
using namespace std;
ll t,sum;
int main(){
    cin>>sum>>t;
    if(sum==0){
        cout<<"NO"<<endl<<"NO";
        return 0;
    }
    if(t==0){
        cout<<"NO"<<endl<<"YES";
        return 0;
    }
    cout<<(sum<0?"YES":"NO")<<endl;
    sum=abs(sum);
    cout<<((sum%2==1)?"YES":"NO")<<endl;
    return 0;
}