public class Demonstrate {
 public static void main (String argv[]) {
  System.out.print("At the end of month 5, there are ");
  System.out.println(rabbits(5));
 }
 public static int rabbits (int n) {
  switch (n) {                                          
   case 0: return 1;                                    
   case 1: return 1;                                    
   default: return rabbits(n - 1) + rabbits(n - 2);     
  }
 }
}