> #include <stdio.h>
> int guess[31][31];    
> int get(int a,int b)
> {
>   if(a<0||b<0) return 0;  //a,b越界，则没猜到，即为0
>    else return guess[a][b];    
> }
> int main()
> {
>        int G,L,i,j,cas=0;
> 	for(i=1;i<=30;i++)
>      for(j=0;j<=30;j++)
>      	guess[i][j]=1+get(i-1,j-1)+get(i-1,j);//get(i-1,j-1)是猜大了，get(i-1,j)是猜小了，+1是猜对
> 	while(1)
>     {
> 	  scanf("%d%d",&G,&L);
> 	  if(G==0&&L==0) return 0;
> 	   printf("Case %d: %d\n",++cas,guess[G][L]);
> 	}
> }