using System;
using System.Collections;
public class Program
{
public static void Main()
{
Hashtable ht = new Hashtable();
ht.Add("c", "c#");
ht.Add("a", "c++");
ht.Add("d", "java");
ht.Add("e", "c");
ht.Add("b", "php");
Console.WriteLine(ht.Count);
ht.Clear();
Console.WriteLine(ht.Count);
}
}
/*
run:
5
0
*/