import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashSet;

public class GEE1005  implements ActionListener{
	private workFrame myFrame;
	
	public GEE1005(){
		myFrame = new workFrame();
        myFrame.getInButton().addActionListener(this);
        myFrame.getClearButton().addActionListener(this);
	}
	
	public static void main(String[] argv){
		GEE1005 ge = new GEE1005();
	}
	/* (non-Javadoc)
	 * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
	 */
	public void actionPerformed(ActionEvent arg0) {
		// TODO Auto-generated method stub
		if(arg0.getSource() == myFrame.getInButton()){

			
			String str = myFrame.getInTextArea().getText();
			int rows = myFrame.getInTextArea().getLineCount();
			int array[][] = new int[rows-1][2];
			for(int i=0;i<rows-1;i++){
				int index = 0;
				String s = new String();
                while(str.charAt(index)!= '\n'){
             	  s = s+str.charAt(index);
             	  index ++;
                }
                str = ""+str.substring(index+1);
                str = ""+str.substring(0);
                //把String s轉化成String 數組array[i]
                int arrayindex =0;
                String sub = new String();
                if(s.length()==0)  continue;
                s = s+' ';
                for(int m=0;m<s.length() && arrayindex<2;m++){
        			
        			if(s.charAt(m)!=' ')
        				sub = sub+s.charAt(m);
        			else{
        				array[i][arrayindex] = Integer.parseInt(sub);
        				sub = "";
        				arrayindex++;
        			}	           			
        		}
			}
			int i =0;
			while(i<rows-2){
				int cityNum=0,loadNum=0,loadNeed=0;
				HashSet hSet = new HashSet();
				if(array[i][0]!=0){                       //判斷是否結束
					cityNum = array[i][0];
					loadNum = array[i][1];
				}
				else
					break;
				
				for(int k=i+1;k<=i+loadNum;k++){         //城市加入集合HashSet
					if(!(hSet.contains(new Integer(array[k][0]))||
							hSet.contains(new Integer(array[k][1])))){
						hSet.add(new Integer(array[k][0]));
						hSet.add(new Integer(array[k][1]));
						loadNeed++;
					}
					else{
						if(hSet.size()<cityNum){
							hSet.add(new Integer(array[k][0]));
							hSet.add(new Integer(array[k][1]));
						}
						else
							break;
					}
				}
				if(hSet.size()<cityNum){
					loadNeed +=cityNum-hSet.size();    //加入剩下的孤立城市
				}
				loadNeed-=1;    //集合開始可以包括一個元素
				myFrame.getOutTextArea().append(""+loadNeed+'\n');
				
				i = i+loadNum+1;
			}
		}
		else if(arg0.getSource() == myFrame.getClearButton()){
			myFrame.getInTextArea().setText("");
			myFrame.getOutTextArea().setText("");
		}
	}
	
}