class Result {


public static int hourglassSum(List<List<Integer>> arr) {
        List<Integer> hourglassList = new ArrayList<>();
        for(int i=0; i<arr.size()-2;i++){
            for(int j=0; j<arr.size()-2;j++){
                int one = arr.get(i).get(j);
                int two = arr.get(i).get(j+1);
                int three = arr.get(i).get(j+2);
                int four = arr.get(i+1).get(j+1);
                int five =arr.get(i+2).get(j);
                int six=arr.get(i+2).get(j+1);
                int seven = arr.get(i+2).get(j+2);
                int hourglass = List.of(one,two,three,four,five,six,seven).stream().mapToInt(x -> x).sum();
                hourglassList.add(hourglass);
            }
        }
        return hourglassList.stream().max((x,y) -> x.compareTo(y)).get();
    }

}