#include<iostream>#include<string.h>#include<map>#include<stdio.h>using namespace std;template<int N> struct BigNum {int d[N];int len;BigNum(){len = 0;}BigNum<N> & operator=(int );BigNum<N> & operator *=(int);BigNum<N> & operator /=(int);void print();};template<int N>BigNum<N> & BigNum<N>::operator=(int n){len = 0;do {d[len++] = n%10;n /= 10;} while(n>0);return *this;}template<int N>BigNum<N> & BigNum<N>::operator *=(int m){int carry = 0;int i;for(i=0;i<len;i++){carry += d[i] * m;d[i] = carry % 10;carry /= 10;}while(carry){d[len++] = carry % 10;carry /= 10;}return *this;}template<int N>BigNum<N> & BigNum<N>::operator /=(int dm){int carry = 0;int i;for(i=len-1;i>=0;i--){carry *= 10;carry += d[i];d[i] = carry / dm;carry = carry % dm;}while(len > 0 && d[len-1] ==0){len--;}return *this;}template<int N>void BigNum<N>::print(){for(int i=len-1;i>=0;i--){printf("%d", d[i]);} printf("n");}BigNum<200> mat;void setup(int n, int m){ mat = 1; int lim = n * m, i; for( i=1; i<=lim; i++){ mat *= i; } for(i=1; i<=n; ++i){ for(lim=1; lim<=m; lim++){ mat/=(i+lim-1); } }}int main(){ int n, m; scanf("%d%d",&n,&m); while(n && m){ if(n > m) swap(n, m); setup(n, m); mat.print(); scanf("%d%d",&n,&m); } return 0;}
