#include <iostream>#include <cstdio>#include <algorithm>using namespace std;typedef __int64  u_int;u_int myc(u_int n,u_int r){	u_int sum=1;	for(u_int i=1;i<=r;i++)	sum=sum*(n+1-i)/i;	return sum;}int main(){	u_int n,m;	while(scanf("%I64d%I64d",&n,&m),m||n){		if(n>m){			u_int tmp=m;			m=n;			n=tmp;		}		u_int s=m+n;		u_int t=s%2?s/2+1:s/2;		n=n>t?s-t:n;		u_int sum=myc(s,n);		printf("%I64d\n",sum);	}	return 0;}