#include <iostream>
using namespace std;
float a, b;
int main()
{
cin>>a>>b;
if (a==0 && b==0)
cout<<"OK";
else if (a==0 && b>=0 || b>=0 && a>=0)
cout<<"OK";
else if (a==0 && b>=0 || b<=0 && a<=0)
cout<<"NO";
else if (a>0 && b<0 || a<0 && b>0)
cout<<"OK";
else
cout<<"NO";
return 0;
}