class Factorial 
  { 
    public static void main(String ar[]) 
    { 
      Integer a, k, f = 1; 

      a = Integer.parseInt(ar[0]); 
    
      for (k = 1; k <= a; k++) 
      { 
        f = f * k; 
      } 
    
      System.out.println("Factorial = " + f); 
    } 
  }