//
//	List1.java
//	Unsorted List
//
import java.util.Scanner;
public class List1
{
	private final int MAX = 50;
	// two instance variables
	private int[] info;
	private int length;
	// default constructor
	public List1()
	{	length = 0;
		info = new int[MAX];
	}
	public boolean IsFull()
	{	return length == MAX;	}
	public void Insert(int item)
	{	info[length] = item;
		length ++;
	}
	public int Sum()
	{	int total = 0;
		for(int i=0; i<length; i++)
			total += info[i];
		return total;
	}
	public int getLength()
	{	return length;	}
	public double average()
	{	return (double)Sum()/length;	}
	public void Print()
	{	for(int i=0; i<length; i++)
			System.out.print(info[i] + " ");
		System.out.println();
	}
	public static void main(String[] args)	// driver
	{	List1 z = new List1();
		Scanner input = new Scanner(System.in);
	/*
		z.Insert(12);
		z.Insert(7);
		z.Insert(15);

		z.Insert(2);
	*/
		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);
	}
}