SumAdjecent

import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class SumAdjacentEqualNumbers {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        String[] values = scanner.nextLine().split(" ");

        List<Double> numbers = new ArrayList<>();

        for (int i = 0; i < values.length; i++) {

            numbers.add(Double.parseDouble(values[i]));
        }

        int i = 0;
        while (i < numbers.size() - 1) {
            if (numbers.get(i).equals(numbers.get(i + 1))) {
                numbers.set(i, numbers.get(i) + numbers.get(i + 1));
                numbers.remove(i + 1);
                i = 0;
            } else {
                i++;
            }
        }
        String output = joinElementsByDelimiter(numbers, " ");


        System.out.print(output);


    }

    private static String joinElementsByDelimiter(List<Double> items, String delimiter) {
        String output = "";

        for (Double item : items) {

            output += (new DecimalFormat("0.#").format(item) + delimiter);


        }
        return output;
    }


}