using System;
using System.Collections.Generic;
using System.Linq;

namespace _9._MatrixMaxSum
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            string[] input = Console.ReadLine().Split(' ');
            int[,] matrix = new int[n, input.Length];
            int sum = 0;
            int maxSum = int.MinValue;

            for (int row = 0; row < n; row++)
            {
                for (int col = 0; col < input.Length; col++)
                {
                    matrix[row, col] = int.Parse(input[col]);
                }
                if (row != n - 1)
                {
                    input = Console.ReadLine().Split(' ');
                }
            }

            int[] coordinates = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();

            for (int i = 0; i < coordinates.Length; i+=2)
            {
                if (coordinates[i] > 0)
                {
                    for (int col = 0; col < Math.Abs(coordinates[i + 1]); col++)
                    {
                        sum += matrix[coordinates[i] - 1, col];
                    }

                }
                else
                {
                    for (int col = input.Length - 1; col >= Math.Abs(coordinates[i + 1]) - 1; col--)
                    {
                        sum += matrix[Math.Abs(coordinates[i]) - 1, col];
                    }
                }
                if (coordinates[i + 1] > 0)
                {
                    for (int row = Math.Abs(coordinates[i]) - 2;  row >= 0; row--)
                    {
                        sum += matrix[row, coordinates[i + 1] - 1];
                    }
                }
                else
                {
                    for (int row = Math.Abs(coordinates[i]); row < n; row++)
                    {
                        sum += matrix[row, Math.Abs(coordinates[i + 1]) - 1];
                    }
                }
                if (sum > maxSum)
                {
                    maxSum = sum;
                }
                sum = 0;
            }
            Console.WriteLine(maxSum);
        }

    }
}