MatrixSum

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

public class MatrixMaxSumByCoordinates {

    static int max(int a, int b) {
        if(a > b)return a;
        else return b;
    }

    static int moveAndSumRow(int[][] matr, int row, int col) {
        int sum = 0;
        if (row >= 0) {
            for (int i = 0; i < max(col, col * (-1)); i++) {
                sum += matr[row - 1][i];
            }
            return sum;
        } else {
            row *= -1;
            for (int i = matr[0].length - 1; i >= max(col, col * (-1)) - 1; i--) {
                sum += matr [row - 1][i];
            }return sum;
        }
    }

    static int moveAndSumCol(int[][] matr, int row, int col) {
        int sum = 0;
        if (row < 0) row = row * (-1);
        if (col > 0) {

            if (row - 1 == 0)     return  0;

            for (int i = row - 2; i <= 0; i--) {
                sum += matr[i][col - 1];
            }
            return sum;
        } else {

            col = col * (-1);
            if(row == matr.length)return 0;
            for (int i = row ; i < matr.length; i++) {
                sum += matr[i][col - 1];
            }return sum;
        }
    }

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        int rowsNumber = Integer.parseInt(br.readLine());
        String[] firstRow = br.readLine().split(" ");
        int colsNumber = firstRow.length;
        int[][] matrix = new int[rowsNumber][colsNumber];
        for (int i = 0; i < colsNumber; i++) {
            matrix[0][i] = Integer.parseInt(firstRow[i]);
        }
        for (int i = 1; i < rowsNumber; i++) {
            String[] newRow = br.readLine().split(" ");
            for (int j = 0; j < colsNumber; j++) {
                matrix[i][j] = Integer.parseInt(newRow[j]);
               // System.out.print( matrix[i][j] );
            }
            //System.out.println();
        }
//        System.out.println();
//        printMatrix(matrix);
        String[] coords = br.readLine().split(" ");
        int[] rowCor = new int[coords.length / 2];
        int[] colCor = new int[coords.length / 2];

        for (int i = 0; i < coords.length; i++) {
            if (i % 2 == 0) rowCor[i / 2] = Integer.parseInt(coords[i]);
        }
        for (int i = 1; i < coords.length ; i++) {
            if( i % 2 != 0) colCor[i / 2] = Integer.parseInt(coords[i]);
        }
//        System.out.println(Arrays.toString(rowCor).replaceAll("\\[|\\]|,|\\s", ""));
//        System.out.println(Arrays.toString(colCor).replaceAll("\\[|\\]|,|\\s", ""));
//        int[][] newP = {rowCor, colCor};
//        System.out.println();
        //printMatrix(newP);

        int maxSum = Integer.MIN_VALUE;
        int crntSum = 0;
        for (int i = 0; i < rowCor.length; i++) {
            crntSum  += moveAndSumRow(matrix, rowCor[i], colCor[i])
                    + moveAndSumCol(matrix, rowCor[i], colCor[i]);
            maxSum = Math.max(maxSum, crntSum);
            crntSum = 0;
        }
        System.out.println(maxSum);
    }

    static void printMatrix(int[][] matr) {
        for (int i = 0; i < matr.length; i++) {
            for (int j = 0; j < matr[0].length; j++) {
                System.out.print(matr[i][j]);
            }
            System.out.println();
        }
    }
}