class Factorial {
      public static void main(String [] a) {
	     System.out.println(new Fac().ComputeFac(10));
	     }
	     }	

class Fac {
      publick int ComputeFac(int num) {
	      int num_aux;	 
	      if (num < 1)
		 num_aux = 1;
	      else
		 num_aux = num * (this.ComputeFac(num-1));
	      return num_aux;
 }
}