import java.util.*;enum W{W;System z;int a,b;{for(Scanner s=new Scanner(z.in);(a=s.nextInt())>0;z.out.printf("%.0f\n",(Math.sqrt(a*a*4+b*b*3)-a)/3))b=s.nextInt();}}
Note that non-ascii characters in the above source code will be escaped (such as \x9f).