Gaus_Raw

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

public class Sum_Firs_And_Penultimate {
    public static void main(String[] args) throws IOException {

        BufferedReader reader =
                new BufferedReader(
                        new InputStreamReader(System.in));

 List<Integer> numbers = Arrays.stream(reader.readLine().split("\\s+"))
                .map(Integer :: parseInt)
                .collect(Collectors.toList());

        int newSize = numbers.size() / 2;

        for (int i = 0; i < newSize; i++) {
            int firstNumber = numbers.get(i);
            int index = numbers.size() - 1;
            int secondNumber = numbers.get(index);
            numbers.set(i, firstNumber + secondNumber);
            numbers.remove(index);
        }
        System.out.println(numbers.toString().replaceAll("\\[|,|\\]", " "));
    }
}