#include <iostream>
using namespace std;
int main(int argc, char* argv[])
{
	int X,Y;
	cin>>X>>Y;
	if (X==Y){
		cout<<0<<endl;
		return 0;
	}
	if (X==0 && Y!=0){
		cout<<2<<endl;
		return 0;
	}
	if (X!=0 &&Y==0){
		cout<<1<<endl;
		return 0;
	}
	if (X==-Y){
		cout<<3<<endl;
		return 0;
	}
	cout<<-1<<endl;
	return 0;
}