1 import java.math.BigInteger; 2 import java.util.*; 3 public class Main { 4       public static void main(String[]args) 5       { 6           Scanner cin=new Scanner(System.in); 7           BigInteger []a=new BigInteger[1000]; 8           a[0]=BigInteger.valueOf(1); 9           for(int i=1; i<=300; i++)10           {11               int m=(4*i-2);12               a[i]=a[i-1].multiply(BigInteger.valueOf(m));13               a[i]=a[i].divide(BigInteger.valueOf(i+1));14           }15           int n;16           while(cin.hasNext())17           {18               n=cin.nextInt();19               if(n==0) break;20               BigInteger ans=BigInteger.valueOf(1);21               for(int i=1; i<=n; i++)22               {23                   ans=ans.multiply(BigInteger.valueOf(i));24               }25               ans=ans.multiply(a[n]);26               System.out.println(ans);27           }28       }29 }