import java.util.Scanner;
public class ListDemo
{
	public static void main(String[] args)	// driver
	{	List z = new List();
		Scanner input = new Scanner(System.in);
		int num;
		while(input.hasNext())
		{	num = input.nextInt();
			z.Insert(num);
		}
		z.Print();
		int s = z.Sum();
		System.out.println("sum = " + s);
		int len = z.getLength();
		System.out.println("length = " + len);
		double avg = z.average();
		System.out.println("average = " + avg);
	}
}