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


namespace _4._ScroogeMcDuck
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] input = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            int[,] matrix = new int[input[0], input[1]];
            int row = input[0];
            int col = input[1];
            int rowStart = 0;
            int colStart = 0;
            int coins = 0;
            for (row = 0; row < matrix.GetLength(0); row++)
            {
                var inputAsArray = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();

                for (col = 0; col < matrix.GetLength(1); col++)
                {
                    matrix[row, col] = inputAsArray[col];
                    if (matrix[row, col] == 0)
                    {
                        rowStart = row;
                        colStart = col;
                    }
                }
            }
            int currentLeft = 0;
            int currentRight = 0;
            int currentUp = 0;
            int currentDown = 0;

            while (true)
            {
                if (colStart - 1 == -1)
                {
                    currentLeft = 0;
                }
                else
                {
                    currentLeft = matrix[rowStart, colStart - 1];
                }
                if (colStart + 1 == input[1])
                {
                    currentRight = 0;
                }
                else
                {
                    currentRight = matrix[rowStart, colStart + 1];
                }
                if (rowStart - 1 == -1)
                {
                    currentUp = 0;
                }
                else
                {
                    currentUp = matrix[rowStart - 1, colStart];
                }
                if (rowStart + 1 == input[0])
                {
                    currentDown = 0;
                }
                else
                {
                    currentDown = matrix[rowStart + 1, colStart];
                }
                if (currentLeft == 0 && currentRight == 0 && currentUp == 0 && currentDown == 0)
                {
                    Console.WriteLine(coins);
                    break;
                }
                if (currentLeft >= currentRight && currentLeft >= currentDown && currentLeft >= currentUp)
                {
                    matrix[rowStart, --colStart] -= 1;
                    coins++;

                }
                else if (currentRight >= currentDown && currentRight >= currentUp)
                {
                    matrix[rowStart, ++colStart] -= 1;
                    coins++;
                }
                else if (currentUp >= currentDown)
                {
                    matrix[--rowStart, colStart] -= 1;
                    coins++;
                }
                else
                {
                    matrix[++rowStart, colStart] -= 1;
                    coins++;
                }

            }


        }
    }
}