package com.telerikacademy.oop;


import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner reader = new Scanner(System.in);
        String[] input = reader.nextLine().split(" ");
        int rows = Integer.parseInt(input[0]);
        int cols = Integer.parseInt(input[1]);
        String[][] myStringArr = new String[rows][cols];
        int startingRow=0;
        int startingCol=0;

        for (int i = 0; i <rows ; i++) {
            myStringArr[i] = reader.nextLine().split(" ");
        }
        int[][] grid = new int[rows][cols];
        for (int i = 0; i <rows ; i++) {
            for (int j = 0; j <cols ; j++) {
                grid[i][j] = Integer.parseInt(myStringArr[i][j]);
                if(grid[i][j] == 0){
                    startingRow = i;
                    startingCol = j;
                    grid[i][j] = -1;
                }
            }
        }

        System.out.println(collectedCoins(grid,startingRow,startingCol));
    }


    public static int collectedCoins(int[][] grid,int row, int col){
        int coinCount = 0;
        if(outOfGrid(grid,row,col)){
            return -1;
        }
        if(grid[row][col]==0){
            return -1;
        }

        if(grid[row][col] >0){
            grid[row][col]--;
        }

        boolean left = outOfGrid(grid,row,col-1);
        boolean right = outOfGrid(grid,row,col+1);
        boolean up = outOfGrid(grid,row-1,col);
        boolean down = outOfGrid(grid,row+1,col);

        if(!left && !right && !up && !down && grid[row][col-1] >= grid[row][col+1] && grid[row][col-1] >=
        grid[row-1][col] && grid[row][col-1] >= grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row,col-1);
        } else if(!left && !right && !up && !down && grid[row][col+1] >= grid[row][col-1] && grid[row][col+1] >=
                grid[row-1][col] && grid[row][col+1] >= grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row,col+1);
        } else if(!left && !right && !up && !down && grid[row-1][col] >= grid[row][col-1] && grid[row-1][col] >=
                grid[row][col+1] && grid[row-1][col] >= grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row-1,col);
        } else if(!left && !right && !up && !down && grid[row+1][col] >= grid[row][col-1] && grid[row+1][col] >=
                grid[row][col+1] && grid[row+1][col] >= grid[row-1][col]){
            coinCount += 1 + collectedCoins(grid,row+1,col);
        } else if(!left && !right && !up && down && grid[row][col-1] >= grid[row][col+1] && grid[row][col-1] >=
                grid[row-1][col]){
            coinCount += 1 + collectedCoins(grid,row,col-1);
        } else if(!left && !right && !up && down && grid[row][col+1] >= grid[row][col-1] && grid[row][col+1] >=
                grid[row-1][col]){
            coinCount += 1 + collectedCoins(grid,row,col+1);
        } else if(!left && !right && !up && down && grid[row-1][col] >= grid[row][col-1] && grid[row-1][col] >=
                grid[row][col+1]){
            coinCount += 1 + collectedCoins(grid,row-1,col);
        } else if(!left && !right && up && !down && grid[row][col-1] >= grid[row][col+1] && grid[row][col-1] >=
                grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row,col-1);
        } else if(!left && !right && up && !down && grid[row][col+1] >= grid[row][col-1] && grid[row][col+1] >=
                grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row,col+1);
        } else if(!left && !right && up && !down && grid[row+1][col] >= grid[row][col-1] && grid[row+1][col] >=
                grid[row][col+1]){
            coinCount += 1 + collectedCoins(grid,row+1,col);
        } else if(!left && right && !up && !down && grid[row][col-1] >= grid[row-1][col] && grid[row][col-1] >=
                grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row,col-1);
        } else if(!left && right && !up && !down && grid[row-1][col] >= grid[row][col-1] && grid[row-1][col] >=
                grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row-1,col);
        } else if(!left && right && !up && !down && grid[row+1][col] >= grid[row][col-1] && grid[row+1][col] >=
                grid[row-1][col]){
            coinCount += 1 + collectedCoins(grid,row+1,col);
        } else if(left && !right && !up && !down &&  grid[row][col+1] >= grid[row-1][col] && grid[row][col+1] >=
                grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row,col+1);
        } else if(left && !right && !up && !down &&  grid[row-1][col] >= grid[row][col+1] && grid[row-1][col] >=
                grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row-1,col);
        } else if(left && !right && !up && !down && grid[row+1][col] >= grid[row][col+1] && grid[row+1][col] >=
                grid[row-1][col]){
            coinCount += 1 + collectedCoins(grid,row+1,col);
        } else if(!left && !right && up && down && grid[row][col-1] >= grid[row][col+1]){
            coinCount += 1 + collectedCoins(grid,row,col-1);
        } else if(!left && !right && up && down && grid[row][col+1] >= grid[row][col-1]){
            coinCount += 1 + collectedCoins(grid,row,col+1);
        } else if(!left && right && !up && down && grid[row][col-1] >= grid[row-1][col]){
            coinCount += 1 + collectedCoins(grid,row,col-1);
        } else if(!left && right && !up && down && grid[row-1][col] >= grid[row][col-1] ){
            coinCount += 1 + collectedCoins(grid,row-1,col);
        } else if(left && !right && !up && down && grid[row][col+1] >= grid[row-1][col]){
            coinCount += 1 + collectedCoins(grid,row,col+1);
        } else if(left && !right && !up && down && grid[row-1][col] >= grid[row][col+1]){
            coinCount += 1 + collectedCoins(grid,row-1,col);
        } else if(!left && right && up && !down && grid[row][col-1] >= grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row,col-1);
        } else if(!left && right && up && !down && grid[row+1][col] >= grid[row][col-1]){
            coinCount += 1 + collectedCoins(grid,row+1,col);
        } else if(left && !right && up && !down && grid[row][col+1] >= grid[row+1][col]){
            coinCount += 1 + collectedCoins(grid,row,col+1);
        } else if(left && !right && up && !down && grid[row+1][col] >= grid[row][col+1]){
            coinCount += 1 + collectedCoins(grid,row+1,col);
        } else if(!left && right && up && down){
            coinCount += 1 + collectedCoins(grid,row,col-1);
        } else if(left && !right && up && down){
            coinCount += 1 + collectedCoins(grid,row,col+1);
        } else if(left && right && !up && down){
            coinCount += 1 + collectedCoins(grid,row-1,col);
        } else if(left && right && up && !down){
            coinCount += 1 + collectedCoins(grid,row+1,col);
        } else {
            coinCount += 1 + collectedCoins(grid,row,col-1);
            coinCount += 1 + collectedCoins(grid,row,col+1);
            coinCount += 1 + collectedCoins(grid,row-1,col);
            coinCount += 1 + collectedCoins(grid,row+1,col);
        }


        return coinCount;
    }



    public static boolean outOfGrid(int[][] grid, int row, int col){
        if (row < 0 || col < 0 || row >= grid.length || col >= grid[0].length){
            return true;
        }
        return false;
    }
}