> #include <stdio.h>
> int main(int argc, char *argv[])
> {   long long i,j,k;
>     double m,n,sum,num,x,y,z,max;
>     while(1)
>     {
>         scanf("%lf %lf",&m,&n);
>         if(m==0&&n==0)
>             break;
>         z=1;
>         if(m!=0&&n!=0)
>         {
>             max=m>n?m:n;
>             for(i=max+1;i<=m+n;i++)
>             {
>                 z=z*i/(i-max);
>             }
>         }
>         printf("%.0lf\n",z);
>     }
>     return 0;
> }
>