package com.telerikacademy;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ScroogeMcDuck2 {
    private static int[][] matrix;

    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String[] str = reader.readLine().split(" ");

        int rows = Integer.parseInt(str[0]);
        int cols = Integer.parseInt(str[1]);

        String[][] input = new String[rows][];

        for (int i = 0; i < rows; i++) {
            input[i] = reader.readLine().split(" ");
        }

        matrix = new int[rows][cols];

        int currRow = 0;
        int currCol = 0;

        for (int i = 0; i < rows; i++) {
            for (int j = 0; j < cols; j++) {
                matrix[i][j] = Integer.parseInt(input[i][j]);
                if (matrix[i][j] == 0) {
                    currCol = j;
                    currRow = i;
                }
            }
        }

        System.out.println(calculateCoins(currRow, currCol));
    }

    private static int calculateCoins(int row, int col) {
        int maxCoins = 0;

        int nextRow = 0;
        int nextCol = 0;

        int[] possibleRows = {-1, 1, 0, 0};
        int[] possibleCols = {0, 0, -1, 1};


        for (int i = 0; i < possibleRows.length; i++) {
            int x = col + possibleRows[i];
            int z = row + possibleCols[i];

            if (x >= 0 && x < matrix[0].length && z >= 0 && z < matrix.length) {
                int tempCoins = matrix[z][x];
                if (tempCoins > maxCoins) {
                    nextCol = x;
                    nextRow = z;
                    maxCoins = tempCoins;
                }
            }
        }

        if (maxCoins == 0) return 0;

        matrix[nextRow][nextCol]--;

        return calculateCoins(nextRow, nextCol) +1;
    }
}