import java.lancs.BasicIo;

public class quiz4_b
{
  public static void main (String[] args) throws Exception
    {
      System.out.println ();
      System.out.print ("type an integer: ");
      int input = BasicIo.readInteger ();

      int output = factorial (input);
      
      System.out.println ("The factorial of " + 
                          input + " is " + output);
    }

  public static int factorial (int number)  
    {
      if (number == 1)
        return number;
      else
        {
          int number_minus_one_factorial = 
            factorial (number - 1);

          int result = number * number_minus_one_factorial;
          return result;
        }
    }
}