import java.util.ArrayList;
import java.util.List;

public class Run {
	
	public static int getNum(List<Cow> cowList,Integer year){
		List<Cow> tempList = new ArrayList<Cow>();
	     for(int i=0,length=cowList.size();i<length;i++){
	    	 Cow cow = cowList.get(i);
	    	 if(cow.getAge()>=5){
	    		 Cow tempcow = new Cow(1);
	    		 tempList.add(tempcow);
	    	 }
	    	 cow.setAge((cow.getAge()+1)); 
	     }
	     year--;
	     cowList.addAll(tempList);
	     System.out.println(year);
	     if(year==0){
	    	 return cowList.size();
	     }
	     return getNum(cowList,year);
	}
	
	/**
	 * @param args
	 */
	public static void main(String[] args) {
	   List<Cow> cowList=  new ArrayList<Cow>();
	   cowList.add(new Cow(1));
	   int year = 20;
	   int num =getNum(cowList,year);
	   System.out.println("aaa"+num);
	}
	
}