#include <iostream>
using namespace std;

int main()
{
    long long m,n,s;
    while (cin >> m >>n && m+n!=0)
    {
        if (m==0 || n==0) {cout << "1" << endl;continue;}
        if (m>n) {long long int temp=m;m=n;n=temp;}
        s=1;
        for (long long int i=1;i<=m;i++)
            s=s*(i+n)/i;
        cout << s << endl;
    }
    return 0;
}