public static void main(String[] args) {
   Roach sam = new Roach(10);
   sam.breed(); // every breeding expands population by 200%
   sam.insecticide(); // every spray kills off 10%
   System.out.println(
       "After the insecticide and breeding poor sam's population is now " + sam.getRoaches());
   sam.breed(); // every breeding expands population by 200%
   sam.insecticide(); // every spray kills off 10%
   System.out.println(
       "After the insecticide and breeding poor sam's population is now " + sam.getRoaches());
   sam.breed(); // every breeding expands population by 200%
   sam.insecticide(); // every spray kills off 10%
   System.out.println(
       "After the insecticide and breeding poor sam's population is now " + sam.getRoaches());
   sam.breed(); // every breeding expands population by 200%
   sam.insecticide(); // every spray kills off 10%
   System.out.println(
       "After the insecticide and breeding poor sam's population is now " + sam.getRoaches());
 }