hourglass java

import java.util.Scanner;

public class HourGlass {

    public static int length = 6;

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        int[] hourGlassValues = new int[(int) Math.pow(length - 2, 2)];

        for (int row = 0, column; row < length; row++) {
            String userInputLine = scanner.nextLine();
            String[] numberArray = userInputLine.split(" ");
            column = 0;
            for (String numberString : numberArray) {
                int number = Integer.parseInt(numberString);
                for (int hourGlass = 0; hourGlass < (length-2)*(length-2); hourGlass++) {
                    if (coordinateChecker(hourGlass, row, column)) {
                        hourGlassValues[hourGlass] += number;
                    }
                }
                column++;
            }
        }
        int maxSum = Integer.MIN_VALUE;
        for (int i = 0; i < hourGlassValues.length; i++) {
            if(hourGlassValues[i] > maxSum) maxSum = hourGlassValues[i];
        }
        System.out.println(maxSum);
    }

    public static boolean coordinateChecker(int hourglassNumber, int row, int column) {
        int coordinateX = hourglassNumber % (length - 2);
        int coordinateY = hourglassNumber / (length - 2);

        return (column >= coordinateX && column <= coordinateX + 2) && (row == coordinateY || row == coordinateY + 2) ||
                row == coordinateY+1 && column == coordinateX+1;
    }
}