import java.lancs.BasicIo;

public class quiz4_a
{
  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)  
    {
      int result = 1;
      for (int i = 1; i <= number; i++)
        {
          result *= i;
        }      

      return result;
    }
}