import java.util.Calendar;
import java.util.*;
import java.text.*;

public class LastDay{
       
     public static void main(String args[]){
   
           Date date = new Date();
           GregorianCalendar gc = new GregorianCalendar();
           gc.add(GregorianCalendar.MONTH,1);
           gc.add(GregorianCalendar.DATE,-date.getDate());
           DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT);
           Date dateTemp = gc.getTime();
           String s = df.format(dateTemp);
           System.out.println(s);
} 
 
}