> #include<stdio.h>
> int main()
> {
>     int n,m,ans,i,j;
>     while(1){
>     scanf("%d%d",&n,&m); if(m==0&&n==0) break;	
>         ans=1;
>         for(i=n+m,j=1;i>=m+1;j++,i--)
>         ans=ans*i/j;
>         printf("%d\n",ans);
>     }
>     return 0;
> }
> //Time Limit Exceeded