/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
   class Emp {
    private int age ;    
    public Emp( int age ){
        super();
        this.age = age;
    }    
    public int hashCode(){
        return age;
    }
    public boolean equals( Object obj ){
        boolean flag = false;
        Emp emp = ( Emp )obj;
        if( emp.age == age )
            flag = true;
        return flag;
    }
}                                                                                                                       class TestEmp{
    public static void main(String[] args)     {
        Emp emp1 = new Emp(23);
        Emp emp2 = new Emp(24);                                                                                       Emp emp3 = new Emp(25);
        Emp emp4 = new Emp(26);
        Emp emp5 = new Emp(27);
        HashSet<Emp> hs = new HashSet<Emp>();
        hs.add(emp1);
        hs.add(emp2);
        hs.add(emp3);
        hs.add(emp4);
        hs.add(emp5);
                                                                                                                               System.out.print(hs.size());
  System.out.print(hs.contains(new Emp(25)));
  System.out.print(hs.remove( new Emp(24)));
  System.out.print(hs.size());                                                                                      }                                                                                                                            }                                        

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