jedi galaxy

import java.io.BufferedReader;
import java.io.InputStreamReader;


public class JediGalaxy {

    public static int[][] galaxy;
    public static int playerRow;
    public static int playerCol;
    public static int evilRow;
    public static int evilCol;
    public static long result = 0;

    public static void main(String[] args){

        try (BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));) {
            String[] dimensions = reader.readLine().trim().split("\\s+");
            int matrixRow = Integer.parseInt(dimensions[0]);
            int matrixCol = Integer.parseInt(dimensions[1]);
            galaxy = new int[matrixRow][matrixCol];
            fillMatrix(galaxy);
            String readerLine = reader.readLine();
            while (!readerLine.equals("Let the Force be with you")) {
                String[] splitLine = readerLine.trim().split("\\s+");
                playerRow = Integer.parseInt(splitLine[0]);
                playerCol = Integer.parseInt(splitLine[1]);
                readerLine = reader.readLine();
                splitLine = readerLine.trim().split("\\s+");
                evilRow = Integer.parseInt(splitLine[0]);
                evilCol = Integer.parseInt(splitLine[1]);
                getPoints();

                readerLine = reader.readLine();
            }
            System.out.println(result);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }

    private static void getPoints() {
        for (int row = evilRow,col = evilCol; row >= 0; row--,col--) {
                 if (isInside(galaxy,row,col)) {
                     galaxy[row][col] = 0;
                }
        }

        for (int row = playerRow,col = playerCol; row >= 0 ; row--,col++) {
             if (isInside(galaxy,row,col)) {
                 result += galaxy[row][col];
             }
        }
    }

    private static boolean isInside(int[][] matrix, int row, int col) {
        return row >= 0 && row < matrix.length && col >= 0 && col < matrix[row].length;
    }

    private static void fillMatrix(int[][] matrix) {
        int index = 0;
        for (int row = 0; row < matrix.length; row++) {
            for (int col = 0; col < matrix[row].length; col++) {
                matrix[row][col] = index++;
            }
        }

    }
}