Poj Solution 1942

http://poj.org/problem?id=1942

//* @author: 82638882@163.com
import java.io.*;
public class Main
{
 public static void main(String[] args) throws IOException
  {
    InputStreamReader is=new InputStreamReader(System.in);
    BufferedReader in=new BufferedReader(is);
    while(true)
    {
    String[] ss=in.readLine().split(" ");
    Long n=Long.parseLong(ss[0]);
    Long m=Long.parseLong(ss[1]);
    if(n==0&&m==0) break;
    long ans=1;
    n=m+n;
    if(m>n-m) m=n-m;
    long temp=m;
    for(long i=n-m+1;i<=n;i++)
    {
        ans*=i;
        while(temp!=0&&ans%temp==0)
        {
            ans/=temp;
            temp--;
        }
    }
    System.out.println(ans);
     }
  }
    
}