package com.company;

import java.util.Scanner;

public class Main {
    public static void main(String[]args) {
        Scanner scanner = new Scanner(System.in);

        String[] size = scanner.nextLine().split(" ");
        int rows = Integer.parseInt(size[0]);
        int columns = Integer.parseInt(size[1]);

        int[][] matrix = new int[rows][columns];

        int currentRow = 0;
        int currentCol = 0;

        for (int r = 0; r < rows; r++) {
            String[] line = scanner.nextLine().split(" ");
            for (int c = 0; c < line.length; c++) {
                matrix[r][c] = Integer.parseInt(line[c]);
                if (matrix[r][c] == 0) {
                    currentRow = r;
                    currentCol = c;
                }
            }
        }
        int one = 0;
        int two = 0;
        int three = 0;
        int four = 0;
        int coins = 0;
        int curr = 0;

        for (int r = 0; r < rows; r++) {
            for (int c = 0; c < columns; c++) {
                if (currentCol - 1 >= 0) {
                    one = matrix[currentRow][currentCol - 1];
                }
                if (currentCol + 1 < columns) {
                    two = matrix[currentRow][currentCol + 1];
                }
                if (currentRow - 1 >= 0) {
                    three = matrix[currentRow - 1][currentCol];
                }
                if (currentRow + 1 < columns) {
                    four = matrix[currentRow + 1][currentCol];
                }
                if (one >= two && one >= three && one >= four) {
                    currentCol = currentCol - 1;
                    curr = matrix[currentRow][currentCol];
                    curr--;
                    matrix[currentRow][currentCol] = curr;
                    coins++;
                } else if (two > one && two >= three && two >= four) {
                    currentCol = currentCol + 1;
                    curr = matrix[currentRow][currentCol];
                    curr--;
                    matrix[currentRow][currentCol] = curr;
                    coins++;
                } else if (three > one && three > two && three >= four) {
                    currentRow = currentRow - 1;
                    curr = matrix[currentRow][currentCol];
                    curr--;
                    matrix[currentRow][currentCol] = curr;
                    coins++;
                } else if (four > one && four > two && four > three) {
                    currentRow = currentRow + 1;
                    curr = matrix[currentRow][currentCol];
                    curr--;
                    matrix[currentRow][currentCol] = curr;
                    coins++;
                }

                if (one == 0 && two == 0 && three == 0 && four == 0) {
                    System.out.println(coins);
                    return;
                }
            }
        }
    }
}