class Fakultet {
  public static int fak(int n) {
    if (n == 1) return n;
    return n * fak(n-1);
  }

  public static void main(String[] args) {
    System.out.println("1! = " + fak(1));
    System.out.println("2! = " + fak(2));
    System.out.println("3! = " + fak(3));
    System.out.println("4! = " + fak(4));
    System.out.println("5! = " + fak(5));
    System.out.println("6! = " + fak(6));
  }
}