숫자 피라미드

class main{ 
     public static void main(String[] args) 
    { 
    int num=1;
	 for (int a=0; a<3;a++)
	  {
		for (int space=2;space>a ;space-- )
		{
                   System.out.print(" ");
                   }
		for (int b=0;b<2*a+1 ;b++)
		{
		System.out.print(num++);
		}	 
                   System.out.print("\n");
	  }
    }
}