import java.util.*;
    public class hashtable 
    {
        public static void main(String args[]) 
        {
            Hashtable object = new Hashtable();
            object.put("I", new Integer(25));
            object.put("L", new Integer(60));
            object.put("U", new Integer(20));
            object.clear();
            System.out.print(object.size());
        }
    }