Java 2D Array

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Solution {



    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {
        int[][] a = new int[6][6];
        int maxSum = Integer.MIN_VALUE;
        try (Scanner scanner = new Scanner(System.in);)
        {
        for (int i = 0; i < 6; i++) {
            for (int j = 0; j < 6; j++) {
                    a[i][j] = scanner.nextInt();
                if(i>1 && j>1)
                {
int sum =a[i][j]+ a[i][j-1]+ a[i][j-2]+ a[i-1][j-1]+ a[i-2][j]+ a[i-2][j-1]+ a[i-2][j-2];
                        if (sum > maxSum) {maxSum = sum;}
                }
            }
        }
        }
    System.out.println(maxSum);

    }
}