package Dec2016;

import java.util.HashSet;

public class Ques1205 {

    public static void main(String[] args){

        StringBuffer sb1 = new StringBuffer("123");
        StringBuffer sb2 = new StringBuffer("123");
        StringBuffer sb3 = new StringBuffer("123");
        StringBuffer sb4 = new StringBuffer("123");

        HashSet<StringBuffer> set = new HashSet<StringBuffer>();
        set.add(sb1);
        set.add(sb2);
        set.add(sb3);
        set.add(sb4);

        System.out.println(set.size());
    }
}