<>;@d=sort{$b<=>$a}glob<>;($x,$y)=map abs,glob<>;

if($x==0&&$y==0){
	print 0;
	exit;
}

for(@d){
	if($x==$_&&$y<=$_||$x<=$_&&$y==$_){
		print 1;
		exit;
	}
}

$d=$d[0];
$z=$x>$y?$x:$y;
$r=($z+$d-1)/$d|0;
$r=2 if $r<2;
print $r;