CondenseArrayToNumber.java

import java.util.Arrays;
import java.util.Scanner;

public class CondenseArrayToNumber {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        int[] numbersArray = Arrays
                .stream(scanner.nextLine().split(" "))
                .mapToInt(Integer ::parseInt)
                .toArray();

        if(numbersArray.length == 1){

            System.out.println(numbersArray[0]);

        }else {

            while (numbersArray.length > 1) {
                int[] condensedArray = new int[numbersArray.length - 1];
                for (int i = 0; i < numbersArray.length - 1; i++) {
                    condensedArray[i] = numbersArray[i] + numbersArray[i + 1];

                }

                numbersArray = condensedArray;

            }

            System.out.println(numbersArray[0]);
        }
    }
}