> #include <iostream>
> #include <cstdio>
> using namespace std;
> 
> int main()
> {
>     __int64 n,m,ans,i,j;
>     while((scanf("%I64d%I64d",&n,&m)) && !(n==0 && m==0)){
>         ans=1;
>         for(i=n+m,j=1;i>=m+1;j++,i--)
>         ans=ans*i/j;
>         printf("%I64d\n",ans);
>     }
>     return 0;
> }