public class MyStack
{
	LinkedList stack;
	
	public MyStack()
	{
		stack = new LinkedList(0);
	}
	
	public void push(int n)
	{
		stack.insert(n);
	}
	
	public void pop()
	{
		stack.delete(0);
	}
	
	public int top()
	{
		return stack.getVal(0);
	}
	
	public void print()
	{
		stack.print();
	}
}