import java.io.PrintStream;

import franck.cse5910.HasVolume;
import franck.cse5910.Shape;
import franck.cse5910.ShapeCollection;

public class PrintVolume 
{
    public static void main(String[] args) 
    {
	PrintStream output = System.out;

	double total = 0;
	ShapeCollection collection = ShapeCollection.getRandom();
	for (Shape shape : collection) 
	{
	    if (shape instanceof HasVolume) 
	    {
		total += ((HasVolume) shape).getVolume();
	    }
	}
	output.printf("%.2f%n", total);
    }
}