import java.util.*;enum M{M;System z;int m,n,i,j,d;{for(Scanner s=new Scanner(z.in);z==z;z.out.println(d))for(m=s.nextInt(),n=s.nextInt(),i=d=46;i>1;j=~-~i*j-m-n,d=j<d?j:d)for(j=~m/2+i--;i*~j--<n;);}}