public class Program {


	public static void main(String[] args) {



	 Expression e1 = new Constant(5);

	 Expression e2 = new AdditionExpression(
			      new Constant(3),
			      new Constant(4) );


	Expression e3;

	e3 = new AdditionExpression
	   (new AdditionExpression(new Constant(2),
				   new Constant(3))
	    ,
	    new TimesExpression(new Constant(4),
			   new AdditionExpression(
			       new Constant(6),
			       new Constant(7))));

	  System.out.println(e3.evaluate());



	   


	}





	//(2+3) + (4 * (6+7))



}