using System;
using System.Linq;

namespace Scrooge_McDuck
{
    class Program
    {
        static void Main(string[] args)
        {
            int[] size = new int[2];
            size = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
            int n = size[0];
            int m = size[1];
            int currow = 0;
            int curcol = 0;
            int[] linearr = new int[m];
            int[,] arr = new int[n, m];
            int counter = 0;
            int max = 0;
            int left = 0, right = 0, up = 0, down = 0;
            for (int row = 0; row < arr.GetLength(0); row++)
            {
                linearr = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();
                for (int col = 0; col < arr.GetLength(1); col++)
                {
                    arr[row, col] = linearr[col];
                    if (arr[row, col] == 0)
                    {
                        currow = row;
                        curcol = col;
                    }
                }
            }
            while (true)
            {
                if (curcol != 0)
                    left = arr[currow, curcol - 1];
                else
                    left = 0;
                if (curcol != m - 1)
                    right = arr[currow, curcol + 1];
                else
                    right = 0;
                if (currow != 0)
                    up = arr[currow - 1, curcol];
                else
                    up = 0;
                if (currow != n - 1)
                    down = arr[currow + 1, curcol];
                else
                    down = 0;
                if (left == 0 && right == 0 && up == 0 && down == 0)
                    break;
                if (left >= right && left >= up && left >= down)
                    max = 1;
                else if (right >= up && right >= down)
                    max = 2;
                else if (up >= down)
                    max = 3;
                else
                    max = 4;
                //max = 1
                //position =>left

                //max = 2
                //position =>right

                //max = 3
                //position =>up

                //max = 4
                //position =>down
                if (max == 1)
                {
                    arr[currow, curcol - 1]--;
                    curcol--;
                    counter++;
                }
                else if (max == 2)
                {
                    arr[currow, curcol + 1]--;
                    curcol++;
                    counter++;
                }
                else if (max == 3)
                {
                    arr[currow - 1, curcol]--;
                    currow--;
                    counter++;
                }
                else if (max == 4)
                {
                    arr[currow + 1, curcol]--;
                    currow++;
                    counter++;
                }
            }
            Console.WriteLine(counter);
        }
    }
}