sub=y-x;
if(sub<4)cout<<sub<<endl;
else
{
	sq=(int)sqrt(sub);
	if(sq*sq==sub){cout<<2*sq-1<<endl;continue;}
	else
	{
		if(sub>sq*sq+(2*sq+1)/2)cout<<2*sq+1<<endl;
		else cout<<2*sq<<endl;
	}
}