import java.util.ArrayList;

public class NumberStatistics {

    private int amountOfNumbers;
    private int sum;


    public NumberStatistics() {
        this.amountOfNumbers = amountOfNumbers;
        this.sum = 0;
        // initialize here the object variable amountOfNumbers
    }

    public void addNumber(int number) {
        ArrayList<Integer> numbers = new ArrayList<Integer>();
        this.amountOfNumbers++;
        numbers.add(number);




    }


        // code here


    public int amountOfNumbers() {
        int counter = 0;
        while (counter < amountOfNumbers) {
            counter ++;
        }
        return counter;
// code here
    }
    public int sum() {
        this.sum = 0;

        //for (int integer: numbers) {
            //sum += integer;
        }// Write your code here
        return sum;
  // write your code here


    }


    public double average() {
        double average = 0.0;
        double newSum = this.sum * 1.0;
        average = newSum / this.amountOfNumbers;
        return average;



// code here
    }
}