// Driver code
public static void Main(String[] args)
{
Stack s = new Stack();
s.push(1);
s.push(2);
s.push(3);
Console.WriteLine("current size: " + s.size());
Console.WriteLine(s.top());
s.pop();
Console.WriteLine(s.top());
s.pop();
Console.WriteLine(s.top());
Console.WriteLine("current size: " + s.size());
/*
* Output :
* current size: 3
* 3
* 2
* 1
* current size: 1
*/
}