lec4.1

import java.util.Scanner;

public class FactorialToTwenty {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        long factorial = 1;
        for(factorial = 1; factorial < 20; factorial++)
        {
            System.out.print("n = ");
            int n = input.nextInt();
            do {
                factorial *= n;
                n--;
                }
                while (n > 0);
                System.out.println("n! = " + factorial);

        }

    }

}